/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Time utility functions
 *
 * Author:
 *   Damon Chaplin (damon@ximian.com)
 *
 * (C) 2001 Ximian, Inc.
 */

#include <config.h>
#define _XOPEN_SOURCE

/* For tm_gmtoff */
#define _BSD_SOURCE

#include <time.h>
#include <sys/time.h>

#ifdef HAVE_NL_LANGINFO
#include <langinfo.h>
#endif /* HAVE_NL_LANGINFO */

#include <string.h>
#include <ctype.h>
#include <glib.h>
#include <glib/gi18n-lib.h>
#include "e-time-utils.h"
#include "e-data-server-util.h"

#ifdef G_OS_WIN32
#ifdef localtime_r
#undef localtime_r
#endif

/* The localtime() in Microsoft's C library is MT-safe */
#define localtime_r(tp,tmp) (localtime(tp)?(*(tmp)=*localtime(tp),(tmp)):0)

#include <windows.h>

static const gchar *
get_locale_string (gint lctype)
{
	gint nbytes = GetLocaleInfo (GetThreadLocale (), lctype, NULL, 0);
	gchar *tem;
	GQuark quark;

	if (nbytes == 0)
		return "???";

	tem = g_malloc (nbytes);

	if (GetLocaleInfo (GetThreadLocale (), lctype, tem, nbytes) == 0) {
		g_free (tem);
		return "???";
	}

	quark = g_quark_from_string (tem);
	g_free (tem);

	return g_quark_to_string (quark);
}

static const gchar *
translate_picture (const gchar *picture)
{
	GString *s = g_string_new ("");
	GQuark quark;

	while (*picture) {
		const gchar *q = picture + 1;
		gint count;

		while (*picture == *q)
			q++;
		count = q - picture;

		switch (*picture) {
		case '\'':
			picture++;
			while (*picture && *picture != '\'') {
				g_string_append_c (s, *picture);
				picture++;
			}
			break;
		case 'd':
			switch (count) {
			case 1:
			case 2:
				g_string_append (s, "%d");
				break;
			case 3:
			case 4:
				g_string_append (s, "%a");
				break;
			}
			picture += count - 1;
			break;
		case 'M':
			switch (count) {
			case 1:
			case 2:
				g_string_append (s, "%m");
				break;
			case 3:
			case 4:
				g_string_append (s, "%b");
				break;
			}
			picture += count - 1;
			break;
		case 'y':
			switch (count) {
			case 1:	/* Last digit of year. Ugh... */
			case 2:
				g_string_append (s, "%y");
				break;
			case 4:
				g_string_append (s, "%Y");
				break;
			}
			picture += count - 1;
			break;
		case 'g':
			/* Era. Huh. Just ignore, as the era stuff
			 * implementation below depends on glibc.
			 */
			picture += count - 1;
			break;
		case 'h':
			g_string_append (s, "%I");
			picture += count - 1;
			break;
		case 'H':
			g_string_append (s, "%H");
			picture += count - 1;
			break;
		case 'm':
			g_string_append (s, "%M");
			picture += count - 1;
			break;
		case 's':
			g_string_append (s, "%S");
			picture += count - 1;
			break;
		case 't':
			g_string_append (s, "%p");
			picture += count - 1;
			break;
		default:
			g_string_append_c (s, *picture);
			break;
		}
		if (*picture)
			picture++;
	}

	quark = g_quark_from_string (s->str);
	g_string_free (s, TRUE);

	return g_quark_to_string (quark);
}

#endif

#ifndef HAVE_STRPTIME

/* strptime() implementation lifted from glibc */

enum ptime_locale_status { not, loc, raw };

/* Copyright (C) 2002, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301 USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <string.h>
#include <time.h>

#ifdef _LIBC
# include "../locale/localeinfo.h"
#endif

#ifndef __P
# if defined __GNUC__ || (defined __STDC__ && __STDC__)
#  define __P(args) args
# else
#  define __P(args) ()
# endif  /* GCC.  */
#endif  /* Not __P.  */

#if !defined HAVE_LOCALTIME_R && !defined localtime_r
# ifdef _LIBC
#  define localtime_r __localtime_r
# else
/* Approximate localtime_r as best we can in its absence.  */
#  define localtime_r my_localtime_r
static struct tm *localtime_r __P ((const time_t *, struct tm *));
static struct tm *
localtime_r (t, tp)
     const time_t *t;
     struct tm *tp;
{
  struct tm *l = localtime (t);
  if (!l)
    return 0;
  *tp = *l;
  return tp;
}
# endif /* !_LIBC */
#endif /* HAVE_LOCALTIME_R && !defined (localtime_r) */

#define match_char(ch1, ch2) if (ch1 != ch2) return NULL
#if defined _LIBC && defined __GNUC__ && __GNUC__ >= 2
# define match_string(cs1, s2) \
  ({ gsize len = strlen (cs1);						      \
     gint result = __strncasecmp_l ((cs1), (s2), len, locale) == 0;	      \
     if (result) (s2) += len;						      \
     result; })
#else
/* Oh come on.  Get a reasonable compiler.  */
# define match_string(cs1, s2) \
  (g_ascii_strncasecmp ((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))
#endif
/* We intentionally do not use isdigit() for testing because this will
   lead to problems with the wide character version.  */
#define get_number(from, to, n) \
  do {									      \
    gint __n = n;							      \
    val = 0;								      \
    while (*rp == ' ')							      \
      ++rp;								      \
    if (*rp < '0' || *rp > '9')						      \
      return NULL;							      \
    do {								      \
      val *= 10;							      \
      val += *rp++ - '0';						      \
    } while (--__n > 0 && val * 10 <= to && *rp >= '0' && *rp <= '9');	      \
    if (val < from || val > to)						      \
      return NULL;							      \
  } while (0)
#ifdef _NL_CURRENT
# define get_alt_number(from, to, n) \
  ({									      \
     __label__ do_normal;						      \
									      \
     if (*decided != raw)						      \
       {								      \
	 val = _nl_parse_alt_digit (&rp HELPER_LOCALE_ARG);		      \
	 if (val == -1 && *decided != loc)				      \
	   {								      \
	     *decided = loc;						      \
	     goto do_normal;						      \
	   }								      \
	if (val < from || val > to)					      \
	  return NULL;							      \
       }								      \
     else								      \
       {								      \
       do_normal:							      \
	 get_number (from, to, n);					      \
       }								      \
    0;									      \
  })
#else
# define get_alt_number(from, to, n) \
  /* We don't have the alternate representation.  */			      \
  get_number(from, to, n)
#endif
#define recursive(new_fmt) \
  (*(new_fmt) != '\0'							      \
   && (rp = __strptime_internal (rp, (new_fmt), tm,			      \
				 decided, era_cnt LOCALE_ARG)) != NULL)

#ifdef _LIBC
/* This is defined in locale/C-time.c in the GNU libc.  */
extern const struct locale_data _nl_C_LC_TIME attribute_hidden;

# define weekday_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (DAY_1)].string)
# define ab_weekday_name \
  (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)
# define month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (MON_1)].string)
# define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].string)
# define HERE_D_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)
# define HERE_D_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_FMT)].string)
# define HERE_AM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (AM_STR)].string)
# define HERE_PM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (PM_STR)].string)
# define HERE_T_FMT_AMPM \
  (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT_AMPM)].string)
# define HERE_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT)].string)

# define strncasecmp(s1, s2, n) __strncasecmp (s1, s2, n)
#else
static gchar const weekday_name[][10] =
  {
    "Sunday", "Monday", "Tuesday", "Wednesday",
    "Thursday", "Friday", "Saturday"
  };
static gchar const ab_weekday_name[][4] =
  {
    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  };
static gchar const month_name[][10] =
  {
    "January", "February", "March", "April", "May", "June",
    "July", "August", "September", "October", "November", "December"
  };
static gchar const ab_month_name[][4] =
  {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  };
# define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
# define HERE_D_FMT "%m/%d/%y"
# define HERE_AM_STR "AM"
# define HERE_PM_STR "PM"
# define HERE_T_FMT_AMPM "%I:%M:%S %p"
# define HERE_T_FMT "%H:%M:%S"

static const gushort __mon_yday[2][13] =
  {
    /* Normal years.  */
    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
    /* Leap years.  */
    { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
  };
#endif

#if defined _LIBC
/* We use this code also for the extended locale handling where the
   function gets as an additional argument the locale which has to be
   used.  To access the values we have to redefine the _NL_CURRENT
   macro.  */
# define strptime		__strptime_l
# undef _NL_CURRENT
# define _NL_CURRENT(category, item) \
  (current->values[_NL_ITEM_INDEX (item)].string)
# undef _NL_CURRENT_WORD
# define _NL_CURRENT_WORD(category, item) \
  (current->values[_NL_ITEM_INDEX (item)].word)
# define LOCALE_PARAM , locale
# define LOCALE_ARG , locale
# define LOCALE_PARAM_PROTO , __locale_t locale
# define LOCALE_PARAM_DECL __locale_t locale;
# define HELPER_LOCALE_ARG , current
# define ISSPACE(Ch) __isspace_l (Ch, locale)
#else
# define LOCALE_PARAM
# define LOCALE_ARG
# define LOCALE_PARAM_DECL
# define LOCALE_PARAM_PROTO
# define HELPER_LOCALE_ARG
# define ISSPACE(Ch) isspace (Ch)
#endif

#ifndef __isleap
/* Nonzero if YEAR is a leap year (every 4 years,
   except every 100th isn't, and every 400th is).  */
# define __isleap(year)	\
  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
#endif

/* Compute the day of the week.  */
static void
day_of_the_week (struct tm *tm)
{
  /* We know that January 1st 1970 was a Thursday (= 4).  Compute the
     the difference between this data in the one on TM and so determine
     the weekday.  */
  gint corr_year = 1900 + tm->tm_year - (tm->tm_mon < 2);
  gint wday = (-473
	      + (365 * (tm->tm_year - 70))
	      + (corr_year / 4)
	      - ((corr_year / 4) / 25) + ((corr_year / 4) % 25 < 0)
	      + (((corr_year / 4) / 25) / 4)
	      + __mon_yday[0][tm->tm_mon]
	      + tm->tm_mday - 1);
  tm->tm_wday = ((wday % 7) + 7) % 7;
}

/* Compute the day of the year.  */
static void
day_of_the_year (struct tm *tm)
{
  tm->tm_yday = (__mon_yday[__isleap (1900 + tm->tm_year)][tm->tm_mon]
		 + (tm->tm_mday - 1));
}

#ifdef _LIBC
gchar *
internal_function
#else
static gchar *
#endif
__strptime_internal (rp, fmt, tm, decided, era_cnt LOCALE_PARAM)
     const gchar *rp;
     const gchar *fmt;
     struct tm *tm;
     enum ptime_locale_status *decided;
     gint era_cnt;
     LOCALE_PARAM_DECL
{
#ifdef _LIBC
  struct locale_data *const current = locale->__locales[LC_TIME];
#endif

  const gchar *rp_backup;
  gint cnt;
  gsize val;
  gint have_I, is_pm;
  gint century, want_century;
  gint want_era;
  gint have_wday, want_xday;
  gint have_yday;
  gint have_mon, have_mday;
  gint have_uweek, have_wweek;
  gint week_no;
#ifdef _NL_CURRENT
  gsize num_eras;
#endif
  struct era_entry *era;

  have_I = is_pm = 0;
  century = -1;
  want_century = 0;
  want_era = 0;
  era = NULL;
  week_no = 0;

  have_wday = want_xday = have_yday = have_mon = have_mday = have_uweek = 0;
  have_wweek = 0;

  while (*fmt != '\0')
    {
      /* A white space in the format string matches 0 more or white
	 space in the input string.  */
      if (ISSPACE (*fmt))
	{
	  while (ISSPACE (*rp))
	    ++rp;
	  ++fmt;
	  continue;
	}

      /* Any character but `%' must be matched by the same character
	 in the iput string.  */
      if (*fmt != '%')
	{
	  match_char (*fmt++, *rp++);
	  continue;
	}

      ++fmt;
#ifndef _NL_CURRENT
      /* We need this for handling the `E' modifier.  */
    start_over:
#endif

      /* Make back up of current processing pointer.  */
      rp_backup = rp;

      switch (*fmt++)
	{
	case '%':
	  /* Match the `%' character itself.  */
	  match_char ('%', *rp++);
	  break;
	case 'a':
	case 'A':
	  /* Match day of week.  */
	  for (cnt = 0; cnt < 7; ++cnt)
	    {
#ifdef _NL_CURRENT
	      if (*decided !=raw)
		{
		  if (match_string (_NL_CURRENT (LC_TIME, DAY_1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (_NL_CURRENT (LC_TIME, DAY_1 + cnt),
				     weekday_name[cnt]))
			*decided = loc;
		      break;
		    }
		  if (match_string (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt),
				     ab_weekday_name[cnt]))
			*decided = loc;
		      break;
		    }
		}
#elif defined (G_OS_WIN32)
	      if (*decided !=raw)
		{
		  if (match_string (get_locale_string (LOCALE_SDAYNAME1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (get_locale_string (LOCALE_SDAYNAME1 + cnt),
				     weekday_name[cnt]))
			*decided = loc;
		      break;
		    }
		  if (match_string (get_locale_string (LOCALE_SABBREVDAYNAME1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (get_locale_string (LOCALE_SABBREVDAYNAME1 + cnt),
				     ab_weekday_name[cnt]))
			*decided = loc;
		      break;
		    }
		}
#endif
	      if (*decided != loc
		  && (match_string (weekday_name[cnt], rp)
		      || match_string (ab_weekday_name[cnt], rp)))
		{
		  *decided = raw;
		  break;
		}
	    }
	  if (cnt == 7)
	    /* Does not match a weekday name.  */
	    return NULL;
	  tm->tm_wday = cnt;
	  have_wday = 1;
	  break;
	case 'b':
	case 'B':
	case 'h':
	  /* Match month name.  */
	  for (cnt = 0; cnt < 12; ++cnt)
	    {
#ifdef _NL_CURRENT
	      if (*decided !=raw)
		{
		  if (match_string (_NL_CURRENT (LC_TIME, MON_1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (_NL_CURRENT (LC_TIME, MON_1 + cnt),
				     month_name[cnt]))
			*decided = loc;
		      break;
		    }
		  if (match_string (_NL_CURRENT (LC_TIME, ABMON_1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (_NL_CURRENT (LC_TIME, ABMON_1 + cnt),
				     ab_month_name[cnt]))
			*decided = loc;
		      break;
		    }
		}
#elif defined (G_OS_WIN32)
	      if (*decided !=raw)
		{
		  if (match_string (get_locale_string (LOCALE_SMONTHNAME1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (get_locale_string (LOCALE_SMONTHNAME1 + cnt),
				     month_name[cnt]))
			*decided = loc;
		      break;
		    }
		  if (match_string (get_locale_string (LOCALE_SABBREVMONTHNAME1 + cnt), rp))
		    {
		      if (*decided == not
			  && strcmp (get_locale_string (LOCALE_SABBREVMONTHNAME1 + cnt),
				     ab_month_name[cnt]))
			*decided = loc;
		      break;
		    }
		}
#endif
	      if (match_string (month_name[cnt], rp)
		  || match_string (ab_month_name[cnt], rp))
		{
		  *decided = raw;
		  break;
		}
	    }
	  if (cnt == 12)
	    /* Does not match a month name.  */
	    return NULL;
	  tm->tm_mon = cnt;
	  want_xday = 1;
	  break;
	case 'c':
	  /* Match locale's date and time format.  */
#ifdef _NL_CURRENT
	  if (*decided != raw)
	    {
	      if (!recursive (_NL_CURRENT (LC_TIME, D_T_FMT)))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (*decided == not &&
		      strcmp (_NL_CURRENT (LC_TIME, D_T_FMT), HERE_D_T_FMT))
		    *decided = loc;
		  want_xday = 1;
		  break;
		}
	      *decided = raw;
	    }
#elif defined (G_OS_WIN32)
	  if (*decided != raw)
	    {
	      gchar *d_t_fmt =
		      g_strconcat (get_locale_string (LOCALE_SSHORTDATE),
				   " ",
				   get_locale_string (LOCALE_STIMEFORMAT),
				   NULL);
	      const gchar *posix_d_t_fmt = translate_picture (d_t_fmt);

	      g_free (d_t_fmt);

	      if (!recursive (posix_d_t_fmt))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (*decided == not &&
		      strcmp (posix_d_t_fmt, HERE_D_T_FMT))
		    *decided = loc;
		  want_xday = 1;
		  break;
		}
	      *decided = raw;
	    }
#endif
	  if (!recursive (HERE_D_T_FMT))
	    return NULL;
	  want_xday = 1;
	  break;
	case 'C':
	  /* Match century number.  */
#ifdef _NL_CURRENT
	match_century:
#endif
	  get_number (0, 99, 2);
	  century = val;
	  want_xday = 1;
	  break;
	case 'd':
	case 'e':
	  /* Match day of month.  */
	  get_number (1, 31, 2);
	  tm->tm_mday = val;
	  have_mday = 1;
	  want_xday = 1;
	  break;
	case 'F':
	  if (!recursive ("%Y-%m-%d"))
	    return NULL;
	  want_xday = 1;
	  break;
	case 'x':
#ifdef _NL_CURRENT
	  if (*decided != raw)
	    {
	      if (!recursive (_NL_CURRENT (LC_TIME, D_FMT)))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (*decided == not
		      && strcmp (_NL_CURRENT (LC_TIME, D_FMT), HERE_D_FMT))
		    *decided = loc;
		  want_xday = 1;
		  break;
		}
	      *decided = raw;
	    }
#elif defined (G_OS_WIN32)
	  if (*decided != raw)
	    {
		const gchar *posix_d_fmt = translate_picture (get_locale_string (LOCALE_SSHORTDATE));
		if (!recursive (posix_d_fmt))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (*decided == not
		      && strcmp (posix_d_fmt, HERE_D_FMT))
		    *decided = loc;
		  want_xday = 1;
		  break;
		}
	      *decided = raw;
	    }
#endif
	  /* Fall through.  */
	case 'D':
	  /* Match standard day format.  */
	  if (!recursive (HERE_D_FMT))
	    return NULL;
	  want_xday = 1;
	  break;
	case 'k':
	case 'H':
	  /* Match hour in 24-hour clock.  */
	  get_number (0, 23, 2);
	  tm->tm_hour = val;
	  have_I = 0;
	  break;
	case 'l':
	  /* Match hour in 12-hour clock.  GNU extension.  */
	case 'I':
	  /* Match hour in 12-hour clock.  */
	  get_number (1, 12, 2);
	  tm->tm_hour = val % 12;
	  have_I = 1;
	  break;
	case 'j':
	  /* Match day number of year.  */
	  get_number (1, 366, 3);
	  tm->tm_yday = val - 1;
	  have_yday = 1;
	  break;
	case 'm':
	  /* Match number of month.  */
	  get_number (1, 12, 2);
	  tm->tm_mon = val - 1;
	  have_mon = 1;
	  want_xday = 1;
	  break;
	case 'M':
	  /* Match minute.  */
	  get_number (0, 59, 2);
	  tm->tm_min = val;
	  break;
	case 'n':
	case 't':
	  /* Match any white space.  */
	  while (ISSPACE (*rp))
	    ++rp;
	  break;
	case 'p':
	  /* Match locale's equivalent of AM/PM.  */
#ifdef _NL_CURRENT
	  if (*decided != raw)
	    {
	      if (match_string (_NL_CURRENT (LC_TIME, AM_STR), rp))
		{
		  if (strcmp (_NL_CURRENT (LC_TIME, AM_STR), HERE_AM_STR))
		    *decided = loc;
		  break;
		}
	      if (match_string (_NL_CURRENT (LC_TIME, PM_STR), rp))
		{
		  if (strcmp (_NL_CURRENT (LC_TIME, PM_STR), HERE_PM_STR))
		    *decided = loc;
		  is_pm = 1;
		  break;
		}
	      *decided = raw;
	    }
#elif defined (G_OS_WIN32)
	  if (*decided != raw)
	    {
		if (match_string (get_locale_string (LOCALE_S1159), rp))
		{
		    if (strcmp (get_locale_string (LOCALE_S1159), HERE_AM_STR))
		    *decided = loc;
		  break;
		}
		if (match_string (get_locale_string (LOCALE_S2359), rp))
		{
		  if (strcmp (get_locale_string (LOCALE_S2359), HERE_PM_STR))
		    *decided = loc;
		  is_pm = 1;
		  break;
		}
	      *decided = raw;
	    }
#endif
	  if (!match_string (HERE_AM_STR, rp))
	    {
	      if (match_string (HERE_PM_STR, rp))
		is_pm = 1;
	      else
		return NULL;
            }
	  break;
	case 'r':
#ifdef _NL_CURRENT
	  if (*decided != raw)
	    {
	      if (!recursive (_NL_CURRENT (LC_TIME, T_FMT_AMPM)))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (*decided == not &&
		      strcmp (_NL_CURRENT (LC_TIME, T_FMT_AMPM),
			      HERE_T_FMT_AMPM))
		    *decided = loc;
		  break;
		}
	      *decided = raw;
	    }
#elif defined (G_OS_WIN32)
	  if (*decided != raw)
	    {
	      gchar *t_p_fmt =
		      g_strconcat (get_locale_string (LOCALE_STIMEFORMAT),
				   " tt",
				   NULL);
	      const gchar *posix_t_p_fmt = translate_picture (t_p_fmt);

	      g_free (t_p_fmt);

	      if (!recursive (posix_t_p_fmt))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (*decided == not &&
		      strcmp (posix_t_p_fmt,
			      HERE_T_FMT_AMPM))
		    *decided = loc;
		  break;
		}
	      *decided = raw;
	    }
#endif
	  if (!recursive (HERE_T_FMT_AMPM))
	    return NULL;
	  break;
	case 'R':
	  if (!recursive ("%H:%M"))
	    return NULL;
	  break;
	case 's':
	  {
	    /* The number of seconds may be very high so we cannot use
	       the `get_number' macro.  Instead read the number
	       character for character and construct the result while
	       doing this.  */
	    time_t secs = 0;
	    if (*rp < '0' || *rp > '9')
	      /* We need at least one digit.  */
	      return NULL;

	    do
	      {
		secs *= 10;
		secs += *rp++ - '0';
	      }
	    while (*rp >= '0' && *rp <= '9');

	    if (localtime_r (&secs, tm) == NULL)
	      /* Error in function.  */
	      return NULL;
	  }
	  break;
	case 'S':
	  get_number (0, 61, 2);
	  tm->tm_sec = val;
	  break;
	case 'X':
#ifdef _NL_CURRENT
	  if (*decided != raw)
	    {
	      if (!recursive (_NL_CURRENT (LC_TIME, T_FMT)))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (strcmp (_NL_CURRENT (LC_TIME, T_FMT), HERE_T_FMT))
		    *decided = loc;
		  break;
		}
	      *decided = raw;
	    }
#elif defined (G_OS_WIN32)
	  if (*decided != raw)
	    {
	      const gchar *posix_t_fmt = translate_picture (get_locale_string (LOCALE_STIMEFORMAT));
	      if (!recursive (posix_t_fmt))
		{
		  if (*decided == loc)
		    return NULL;
		  else
		    rp = rp_backup;
		}
	      else
		{
		  if (strcmp (posix_t_fmt, HERE_T_FMT))
		    *decided = loc;
		  break;
		}
	      *decided = raw;
	    }
#endif
	  /* Fall through.  */
	case 'T':
	  if (!recursive (HERE_T_FMT))
	    return NULL;
	  break;
	case 'u':
	  get_number (1, 7, 1);
	  tm->tm_wday = val % 7;
	  have_wday = 1;
	  break;
	case 'g':
	  get_number (0, 99, 2);
	  /* XXX This cannot determine any field in TM.  */
	  break;
	case 'G':
	  if (*rp < '0' || *rp > '9')
	    return NULL;
	  /* XXX Ignore the number since we would need some more
	     information to compute a real date.  */
	  do
	    ++rp;
	  while (*rp >= '0' && *rp <= '9');
	  break;
	case 'U':
	  get_number (0, 53, 2);
	  week_no = val;
	  have_uweek = 1;
	  break;
	case 'W':
	  get_number (0, 53, 2);
	  week_no = val;
	  have_wweek = 1;
	  break;
	case 'V':
	  get_number (0, 53, 2);
	  /* XXX This cannot determine any field in TM without some
	     information.  */
	  break;
	case 'w':
	  /* Match number of weekday.  */
	  get_number (0, 6, 1);
	  tm->tm_wday = val;
	  have_wday = 1;
	  break;
	case 'y':
#ifdef _NL_CURRENT
	match_year_in_century:
#endif
	  /* Match year within century.  */
	  get_number (0, 99, 2);
	  /* The "Year 2000: The Millennium Rollover" paper suggests that
	     values in the range 69-99 refer to the twentieth century.  */
	  tm->tm_year = val >= 69 ? val : val + 100;
	  /* Indicate that we want to use the century, if specified.  */
	  want_century = 1;
	  want_xday = 1;
	  break;
	case 'Y':
	  /* Match year including century number.  */
	  get_number (0, 9999, 4);
	  tm->tm_year = val - 1900;
	  want_century = 0;
	  want_xday = 1;
	  break;
	case 'Z':
	  /* XXX How to handle this?  */
	  break;
	case 'E':
#ifdef _NL_CURRENT
	  switch (*fmt++)
	    {
	    case 'c':
	      /* Match locale's alternate date and time format.  */
	      if (*decided != raw)
		{
		  const gchar *fmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT);

		  if (*fmt == '\0')
		    fmt = _NL_CURRENT (LC_TIME, D_T_FMT);

		  if (!recursive (fmt))
		    {
		      if (*decided == loc)
			return NULL;
		      else
			rp = rp_backup;
		    }
		  else
		    {
		      if (strcmp (fmt, HERE_D_T_FMT))
			*decided = loc;
		      want_xday = 1;
		      break;
		    }
		  *decided = raw;
		}
	      /* The C locale has no era information, so use the
		 normal representation.  */
	      if (!recursive (HERE_D_T_FMT))
		return NULL;
	      want_xday = 1;
	      break;
	    case 'C':
	      if (*decided != raw)
		{
		  if (era_cnt >= 0)
		    {
		      era = _nl_select_era_entry (era_cnt HELPER_LOCALE_ARG);
		      if (era != NULL && match_string (era->era_name, rp))
			{
			  *decided = loc;
			  break;
			}
		      else
			return NULL;
		    }

		  num_eras = _NL_CURRENT_WORD (LC_TIME,
					       _NL_TIME_ERA_NUM_ENTRIES);
		  for (era_cnt = 0; era_cnt < (gint) num_eras;
		       ++era_cnt, rp = rp_backup)
		    {
		      era = _nl_select_era_entry (era_cnt
						  HELPER_LOCALE_ARG);
		      if (era != NULL && match_string (era->era_name, rp))
			{
			  *decided = loc;
			  break;
			}
		    }
		  if (era_cnt != (gint) num_eras)
		    break;

		  era_cnt = -1;
		  if (*decided == loc)
		    return NULL;

		  *decided = raw;
		}
	      /* The C locale has no era information, so use the
		 normal representation.  */
	      goto match_century;
	    case 'y':
	      if (*decided != raw)
		{
		  get_number(0, 9999, 4);
		  tm->tm_year = val;
		  want_era = 1;
		  want_xday = 1;
		  want_century = 1;

		  if (era_cnt >= 0)
		    {
		      assert (*decided == loc);

		      era = _nl_select_era_entry (era_cnt HELPER_LOCALE_ARG);
		      gint match = FALSE;
		      if (era != NULL)
			{
			  gint delta = ((tm->tm_year - era->offset)
				       * era->absolute_direction);
			  match = (delta >= 0
				   && delta < (((int64_t) era->stop_date[0]
						- (int64_t) era->start_date[0])
					       * era->absolute_direction));
			}
		      if (!match)
			return NULL;

		      break;
		    }

		  num_eras = _NL_CURRENT_WORD (LC_TIME,
					       _NL_TIME_ERA_NUM_ENTRIES);
		  for (era_cnt = 0; era_cnt < (gint) num_eras; ++era_cnt)
		    {
		      era = _nl_select_era_entry (era_cnt
						  HELPER_LOCALE_ARG);
		      if (era != NULL)
			{
			  gint delta = ((tm->tm_year - era->offset)
				       * era->absolute_direction);
			  if (delta >= 0
			      && delta < (((int64_t) era->stop_date[0]
					   - (int64_t) era->start_date[0])
					  * era->absolute_direction))
			    {
			      *decided = loc;
			      break;
			    }
			}
		    }
		  if (era_cnt != (gint) num_eras)
		    break;

		  era_cnt = -1;
		  if (*decided == loc)
		    return NULL;

		  *decided = raw;
		}

	      goto match_year_in_century;
	    case 'Y':
	      if (*decided != raw)
		{
		  num_eras = _NL_CURRENT_WORD (LC_TIME,
					       _NL_TIME_ERA_NUM_ENTRIES);
		  for (era_cnt = 0; era_cnt < (gint) num_eras;
		       ++era_cnt, rp = rp_backup)
		    {
		      era = _nl_select_era_entry (era_cnt HELPER_LOCALE_ARG);
		      if (era != NULL && recursive (era->era_format))
			break;
		    }
		  if (era_cnt == (gint) num_eras)
		    {
		      era_cnt = -1;
		      if (*decided == loc)
			return NULL;
		      else
			rp = rp_backup;
		    }
		  else
		    {
		      *decided = loc;
		      era_cnt = -1;
		      break;
		    }

		  *decided = raw;
		}
	      get_number (0, 9999, 4);
	      tm->tm_year = val - 1900;
	      want_century = 0;
	      want_xday = 1;
	      break;
	    case 'x':
	      if (*decided != raw)
		{
		  const gchar *fmt = _NL_CURRENT (LC_TIME, ERA_D_FMT);

		  if (*fmt == '\0')
		    fmt = _NL_CURRENT (LC_TIME, D_FMT);

		  if (!recursive (fmt))
		    {
		      if (*decided == loc)
			return NULL;
		      else
			rp = rp_backup;
		    }
		  else
		    {
		      if (strcmp (fmt, HERE_D_FMT))
			*decided = loc;
		      break;
		    }
		  *decided = raw;
		}
	      if (!recursive (HERE_D_FMT))
		return NULL;
	      break;
	    case 'X':
	      if (*decided != raw)
		{
		  const gchar *fmt = _NL_CURRENT (LC_TIME, ERA_T_FMT);

		  if (*fmt == '\0')
		    fmt = _NL_CURRENT (LC_TIME, T_FMT);

		  if (!recursive (fmt))
		    {
		      if (*decided == loc)
			return NULL;
		      else
			rp = rp_backup;
		    }
		  else
		    {
		      if (strcmp (fmt, HERE_T_FMT))
			*decided = loc;
		      break;
		    }
		  *decided = raw;
		}
	      if (!recursive (HERE_T_FMT))
		return NULL;
	      break;
	    default:
	      return NULL;
	    }
	  break;
#else
	  /* We have no information about the era format.  Just use
	     the normal format.  */
	  if (*fmt != 'c' && *fmt != 'C' && *fmt != 'y' && *fmt != 'Y'
	      && *fmt != 'x' && *fmt != 'X')
	    /* This is an illegal format.  */
	    return NULL;

	  goto start_over;
#endif
	case 'O':
	  switch (*fmt++)
	    {
	    case 'd':
	    case 'e':
	      /* Match day of month using alternate numeric symbols.  */
	      get_alt_number (1, 31, 2);
	      tm->tm_mday = val;
	      have_mday = 1;
	      want_xday = 1;
	      break;
	    case 'H':
	      /* Match hour in 24-hour clock using alternate numeric
		 symbols.  */
	      get_alt_number (0, 23, 2);
	      tm->tm_hour = val;
	      have_I = 0;
	      break;
	    case 'I':
	      /* Match hour in 12-hour clock using alternate numeric
		 symbols.  */
	      get_alt_number (1, 12, 2);
	      tm->tm_hour = val % 12;
	      have_I = 1;
	      break;
	    case 'm':
	      /* Match month using alternate numeric symbols.  */
	      get_alt_number (1, 12, 2);
	      tm->tm_mon = val - 1;
	      have_mon = 1;
	      want_xday = 1;
	      break;
	    case 'M':
	      /* Match minutes using alternate numeric symbols.  */
	      get_alt_number (0, 59, 2);
	      tm->tm_min = val;
	      break;
	    case 'S':
	      /* Match seconds using alternate numeric symbols.  */
	      get_alt_number (0, 61, 2);
	      tm->tm_sec = val;
	      break;
	    case 'U':
	      get_alt_number (0, 53, 2);
	      week_no = val;
	      have_uweek = 1;
	      break;
	    case 'W':
	      get_alt_number (0, 53, 2);
	      week_no = val;
	      have_wweek = 1;
	      break;
	    case 'V':
	      get_alt_number (0, 53, 2);
	      /* XXX This cannot determine any field in TM without
		 further information.  */
	      break;
	    case 'w':
	      /* Match number of weekday using alternate numeric symbols.  */
	      get_alt_number (0, 6, 1);
	      tm->tm_wday = val;
	      have_wday = 1;
	      break;
	    case 'y':
	      /* Match year within century using alternate numeric symbols.  */
	      get_alt_number (0, 99, 2);
	      tm->tm_year = val >= 69 ? val : val + 100;
	      want_xday = 1;
	      break;
	    default:
	      return NULL;
	    }
	  break;
	default:
	  return NULL;
	}
    }

  if (have_I && is_pm)
    tm->tm_hour += 12;

  if (century != -1)
    {
      if (want_century)
	tm->tm_year = tm->tm_year % 100 + (century - 19) * 100;
      else
	/* Only the century, but not the year.  Strange, but so be it.  */
	tm->tm_year = (century - 19) * 100;
    }

#ifdef _NL_CURRENT
  if (era_cnt != -1)
    {
      era = _nl_select_era_entry (era_cnt HELPER_LOCALE_ARG);
      if (era == NULL)
	return NULL;
      if (want_era)
	tm->tm_year = (era->start_date[0]
		       + ((tm->tm_year - era->offset)
			  * era->absolute_direction));
      else
	/* Era start year assumed.  */
	tm->tm_year = era->start_date[0];
    }
  else
#endif
    if (want_era)
      {
	/* No era found but we have seen an E modifier.  Rectify some
	   values.  */
	if (want_century && century == -1 && tm->tm_year < 69)
	  tm->tm_year += 100;
      }

  if (want_xday && !have_wday)
    {
      if ( !(have_mon && have_mday) && have_yday)
	{
	  /* We don't have tm_mon and/or tm_mday, compute them.  */
	  gint t_mon = 0;
	  while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon] <= tm->tm_yday)
	      t_mon++;
	  if (!have_mon)
	      tm->tm_mon = t_mon - 1;
	  if (!have_mday)
	      tm->tm_mday =
		(tm->tm_yday
		 - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);
	}
      day_of_the_week (tm);
    }

  if (want_xday && !have_yday)
    day_of_the_year (tm);

  if ((have_uweek || have_wweek) && have_wday)
    {
      gint save_wday = tm->tm_wday;
      gint save_mday = tm->tm_mday;
      gint save_mon = tm->tm_mon;
      gint w_offset = have_uweek ? 0 : 1;

      tm->tm_mday = 1;
      tm->tm_mon = 0;
      day_of_the_week (tm);
      if (have_mday)
	tm->tm_mday = save_mday;
      if (have_mon)
	tm->tm_mon = save_mon;

      if (!have_yday)
	tm->tm_yday = ((7 - (tm->tm_wday - w_offset)) % 7
		       + (week_no - 1) *7
		       + save_wday - w_offset);

      if (!have_mday || !have_mon)
	{
	  gint t_mon = 0;
	  while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon]
		 <= tm->tm_yday)
	    t_mon++;
	  if (!have_mon)
	    tm->tm_mon = t_mon - 1;
	  if (!have_mday)
	      tm->tm_mday =
		(tm->tm_yday
		 - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);
	}

      tm->tm_wday = save_wday;
    }

  return (gchar *) rp;
}

static gchar *
strptime (buf, format, tm LOCALE_PARAM)
     const gchar *buf;
     const gchar *format;
     struct tm *tm;
     LOCALE_PARAM_DECL
{
  enum ptime_locale_status decided;

#ifdef _NL_CURRENT
  decided = not;
#elif defined (G_OS_WIN32)
  decided = not;
#else
  decided = raw;
#endif
  return __strptime_internal (buf, format, tm, &decided, -1 LOCALE_ARG);
}

#ifdef _LIBC
weak_alias (__strptime_l, strptime_l)
#endif
#endif	/* HAVE_STRPTIME */

/* Returns whether a string is NULL, empty, or full of whitespace */
static gboolean
string_is_empty (const gchar *value)
{
	const gchar *p;
	gboolean empty = TRUE;

	if (value) {
		p = value;
		while (*p) {
			if (!isspace (*p)) {
				empty = FALSE;
				break;
			}
			p++;
		}
	}
	return empty;
}

/* Takes a number of format strings for strptime() and attempts to parse a
 * string with them.
 */
static ETimeParseStatus
parse_with_strptime (const gchar *value, struct tm *result, const gchar **formats, gint n_formats)
{
	const gchar *parse_end = NULL, *pos;
	gchar *locale_str;
	gchar *format_str;
	ETimeParseStatus parse_ret;
	gint i, n;

	if (string_is_empty (value)) {
		memset (result, 0, sizeof (*result));
		result->tm_isdst = -1;
		return E_TIME_PARSE_NONE;
	}

	parse_ret =  E_TIME_PARSE_INVALID;
	locale_str = g_locale_from_utf8 (value, -1, NULL, NULL, NULL);
	pos = (const gchar *) locale_str;

	if (!locale_str)
		return E_TIME_PARSE_INVALID;

	/* Skip whitespace */
	while (n = (gint)((guchar)*pos), isspace (n) != 0)
		pos++;

	/* Try each of the formats in turn */

	for (i = 0; i < n_formats; i++) {
		memset (result, 0, sizeof (*result));
		format_str = g_locale_from_utf8 (formats[i], -1, NULL, NULL, NULL);
		parse_end = strptime (pos, format_str, result);
		g_free (format_str);
		if (parse_end) {
			/* If we parsed something, make sure we parsed the entire string. */
			/* Skip whitespace */
			while (isspace (*parse_end))
				parse_end++;

			if (*parse_end == '\0') {
				parse_ret = E_TIME_PARSE_OK;
				break;
			}
		}
	}

	result->tm_isdst = -1;

	g_free (locale_str);

	return (parse_ret);

}

static void
correct_two_digit_year (struct tm *result, gboolean *two_digit_year)
{
	g_return_if_fail (result != NULL);

	if (two_digit_year)
		*two_digit_year = FALSE;

	/* If a 2-digit year was used we use the current century. */
	if (result->tm_year < 0 && result->tm_year < -1800) {
		time_t t = time (NULL);
		struct tm *today_tm = localtime (&t);

		/* This should convert it into a value from 0 to 99. */
		result->tm_year += 1900;

		/* Now add on the century. */
		result->tm_year += today_tm->tm_year
			- (today_tm->tm_year % 100);

		if (two_digit_year)
			*two_digit_year = TRUE;
	}
}

/* Returns TRUE if the locale has 'am' and 'pm' strings defined, in which
   case the user can choose between 12 and 24-hour time formats. */
static gboolean
locale_supports_12_hour_format (void)
{
	struct tm tmp_tm = { 0 };
	gchar s[16];

	e_utf8_strftime (s, sizeof (s), "%p", &tmp_tm);
	return s[0] != '\0';
}

static gboolean
has_correct_date (const struct tm *value)
{
	const gint days_in_month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	gint days, year;

	g_return_val_if_fail (value != NULL, FALSE);
	g_return_val_if_fail (value->tm_mon >= 0 && value->tm_mon < 12, FALSE);

	year = value->tm_year  + 1900;
	days = days_in_month[value->tm_mon];
	if (value->tm_mon == 1 && ((year <= 1752) ? (!(year % 4)) : ((!(year % 4) && (year % 100)) || !(year % 400))))
		days++;

	return value->tm_mday >= 1 && value->tm_mday <= days;
}

/**
 * e_time_parse_date_and_time_ex:
 * @value: The string to parse a date and time from.
 * @result: A #tm to store the result in.
 * @two_digit_year: set to TRUE, is parsing with two-digit year, else FALSE,
 *    but only when not NULL.
 *
 * Parses a string @value containing a date and a time and stores the
 * result in @result. The date in @value is expected to be in a format
 * like "Wed 3/13/00 14:20:00", though gettext() is used to support the
 * appropriate local formats. There is also some leniency on the
 * format of the string, e.g. the weekday can be skipped or 12-hour
 * formats with am/pm can be used.
 *
 * Returns: E_TIME_PARSE_OK if the string was successfully parsed,
 *          E_TIME_PARSE_NONE if the string was empty, or
 *          E_TIME_PARSE_INVALID if the string could not be parsed.
 *
 * Since: 2.22
 */
ETimeParseStatus
e_time_parse_date_and_time_ex		(const gchar	*value,
					 struct tm	*result,
					 gboolean	*two_digit_year)
{
	struct tm *today_tm;
	time_t t;
	const gchar *format[16];
	gint num_formats = 0;
	gboolean use_12_hour_formats = locale_supports_12_hour_format ();
	ETimeParseStatus status;

	if (string_is_empty (value)) {
		memset (result, 0, sizeof (*result));
		result->tm_isdst = -1;
		return E_TIME_PARSE_NONE;
	}

	/* We'll parse the whole date and time in one go, otherwise we get
	   into i18n problems. We attempt to parse with several formats,
	   longest first. Note that we only use the '%p' specifier if the
	   locale actually has 'am' and 'pm' strings defined, otherwise we
	   will get incorrect results. Note also that we try to use exactly
	   the same strings as in e_time_format_date_and_time(), to try to
	   avoid i18n problems. We also use cut-down versions, so users don't
	   have to type in the weekday or the seconds, for example.
	   Note that all these formats include the full date, and the time
	   will be set to 00:00:00 before parsing, so we don't need to worry
	   about filling in any missing fields after parsing. */

	/*
	 * Try the full times, with the weekday. Then try without seconds,
	 * and without minutes, and finally with no time at all.
	 */
	if (use_12_hour_formats) {
		/* strptime format of a weekday, a date and a time,
		   in 12-hour format. */
		format[num_formats++] = _("%a %m/%d/%Y %I:%M:%S %p");
	}

	/* strptime format of a weekday, a date and a time,
	   in 24-hour format. */
	format[num_formats++] = _("%a %m/%d/%Y %H:%M:%S");

	if (use_12_hour_formats) {
		/* strptime format of a weekday, a date and a time,
		   in 12-hour format, without seconds. */
		format[num_formats++] = _("%a %m/%d/%Y %I:%M %p");
	}

	/* strptime format of a weekday, a date and a time,
	   in 24-hour format, without seconds. */
	format[num_formats++] = _("%a %m/%d/%Y %H:%M");

	if (use_12_hour_formats) {
		/* strptime format of a weekday, a date and a time,
		   in 12-hour format, without minutes or seconds. */
		format[num_formats++] = _("%a %m/%d/%Y %I %p");
	}

	/* strptime format of a weekday, a date and a time,
	   in 24-hour format, without minutes or seconds. */
	format[num_formats++] = _("%a %m/%d/%Y %H");

	/* strptime format of a weekday and a date. */
	format[num_formats++] = _("%a %m/%d/%Y");

	/*
	 * Now try all the above formats again, but without the weekday.
	 */
	if (use_12_hour_formats) {
		/* strptime format of a date and a time, in 12-hour format. */
		format[num_formats++] = _("%m/%d/%Y %I:%M:%S %p");
	}

	/* strptime format of a date and a time, in 24-hour format. */
	format[num_formats++] = _("%m/%d/%Y %H:%M:%S");

	if (use_12_hour_formats) {
		/* strptime format of a date and a time, in 12-hour format,
		   without seconds. */
		format[num_formats++] = _("%m/%d/%Y %I:%M %p");
	}

	/* strptime format of a date and a time, in 24-hour format,
	   without seconds. */
	format[num_formats++] = _("%m/%d/%Y %H:%M");

	if (use_12_hour_formats) {
		/* strptime format of a date and a time, in 12-hour format,
		   without minutes or seconds. */
		format[num_formats++] = _("%m/%d/%Y %I %p");
	}

	/* strptime format of a date and a time, in 24-hour format,
	   without minutes or seconds. */
	format[num_formats++] = _("%m/%d/%Y %H");

	/* strptime format of a weekday and a date. */
	format[num_formats++] = _("%m/%d/%Y");

	if (two_digit_year)
		*two_digit_year = FALSE;

	status = parse_with_strptime (value, result, format, num_formats);

	if (status == E_TIME_PARSE_OK && !has_correct_date (result))
		status = E_TIME_PARSE_INVALID;

	/* Note that we checked if it was empty already, so it is either OK
	   or INVALID here. */
	if (status == E_TIME_PARSE_OK) {
		correct_two_digit_year (result, two_digit_year);
	} else {
		/* Now we try to just parse a time, assuming the current day.*/
		status = e_time_parse_time (value, result);
		if (status == E_TIME_PARSE_OK) {
			/* We fill in the current day. */
			t = time (NULL);
			today_tm = localtime (&t);
			result->tm_mday = today_tm->tm_mday;
			result->tm_mon  = today_tm->tm_mon;
			result->tm_year = today_tm->tm_year;
		}
	}

	return status;
}

ETimeParseStatus
e_time_parse_date_and_time		(const gchar	*value,
					 struct tm	*result)
{
	return e_time_parse_date_and_time_ex (value, result, NULL);
}

/**
 * e_time_parse_date_ex:
 * @value: A date string.
 * @result: Return value for the parsed date.
 * @two_digit_year: set to TRUE, is parsing with two-digit year, else FALSE,
 *    but only when not NULL.
 *
 * Takes in a date string entered by the user and tries to convert it to
 * a struct #tm.
 *
 * Returns: An #ETimeParseStatus result code indicating whether
 * @value was an empty string, a valid date, or an invalid date.
 *
 * Since: 2.22
 **/
ETimeParseStatus
e_time_parse_date_ex (const gchar *value, struct tm *result, gboolean *two_digit_year)
{
	const gchar *format[4];
	ETimeParseStatus status;

	g_return_val_if_fail (value != NULL, E_TIME_PARSE_INVALID);
	g_return_val_if_fail (result != NULL, E_TIME_PARSE_INVALID);

	/* according to the current locale */
	format [0] = ("%x");

	/* according to the current locale with forced 4-digit year*/
	format[1] = e_time_get_d_fmt_with_4digit_year ();

	/* strptime format of a weekday and a date. */
	format [2] = _("%a %m/%d/%Y");

	/* This is the preferred date format for the locale. */
	format [3] = _("%m/%d/%Y");

	if (two_digit_year) {
		/* when we need to know about two digit year, then always first try
		   full year, because for example nl_NL have format %d-%m-%y and it
		   changes from two year itself, which isn't what we want */
		const gchar *tmp = format[1];
		format[1] = format[0];
		format[0] = tmp;
		*two_digit_year = FALSE;
	}

	status = parse_with_strptime (value, result, format, G_N_ELEMENTS (format));

	if (status == E_TIME_PARSE_OK && !has_correct_date (result))
		status = E_TIME_PARSE_INVALID;

	if (status == E_TIME_PARSE_OK) {
		correct_two_digit_year (result, two_digit_year);
	}

	if (two_digit_year)
		g_free ((gchar *)format[0]);
	else
		g_free ((gchar *)format[1]);

	return status;
}

ETimeParseStatus
e_time_parse_date (const gchar *value, struct tm *result)
{
	return e_time_parse_date_ex (value, result, NULL);
}

/**
 * e_time_parse_time:
 * @value: The string to parse a time from.
 * @result: A #tm to store the result in.
 *
 * Parses @value, a string containing a time. @value is expected to be
 * in a format like "14:20:00". gettext() is used to
 * support the appropriate local formats and slightly
 * different formats, such as 12-hour formats with am/pm,
 * are accepted as well.
 *
 * Returns: An #ETimeParseStatus result code indicating whether
 * @value was an empty string, a valid date, or an invalid date.
 **/
ETimeParseStatus
e_time_parse_time (const gchar *value, struct tm *result)
{
	const gchar *format[7];
	gint num_formats = 0;
	gboolean use_12_hour_formats = locale_supports_12_hour_format ();

	if (use_12_hour_formats) {
		/* strptime format for a time of day, in 12-hour format. */
		format[num_formats++] = _("%I:%M:%S %p");
	}

	/* strptime format for a time of day, in 24-hour format. */
	format[num_formats++] = _("%H:%M:%S");

	if (use_12_hour_formats) {
		/* strptime format for time of day, without seconds,
		   in 12-hour format. */
		format[num_formats++] = _("%I:%M %p");
	}

	/* strptime format for time of day, without seconds 24-hour format. */
	format[num_formats++] = _("%H:%M");

	/* strptime format for time of day, without seconds 24-hour format, and no colon. */
	format[num_formats++] = _("%H%M");

	if (use_12_hour_formats) {
		/* strptime format for hour and AM/PM, 12-hour format. */
		format[num_formats++] = _("%I %p");
	}

	/* strptime format for hour, 24-hour format. */
	format[num_formats++] = "%H";

	return parse_with_strptime (value, result, format, num_formats);
}

/**
 * e_time_format_date_and_time:
 * @date_tm: The #tm to convert to a string.
 * @use_24_hour_format: A #gboolean.
 * @show_midnight: A #gboolean.
 * @show_zero_seconds: A #gboolean.
 * @buffer: A #char buffer to store the time string in.
 * @buffer_size: The length of @buffer.
 *
 * Creates a string representation of the time value @date_tm and
 * stores it in @buffer.  @buffer_size should be at least 64 to be
 * safe. If @show_midnight is #FALSE, and the time is midnight, then
 * only the date is stored in @buffer. If @show_zero_seconds is
 * #FALSE, then if the time has zero seconds only the hour and minute
 * of the time are stored in @buffer.
 **/
void
e_time_format_date_and_time		(struct tm	*date_tm,
					 gboolean	 use_24_hour_format,
					 gboolean	 show_midnight,
					 gboolean	 show_zero_seconds,
					 gchar		*buffer,
					 gint		 buffer_size)
{
	gchar *format;

	if (!show_midnight && date_tm->tm_hour == 0
	    && date_tm->tm_min == 0 && date_tm->tm_sec == 0) {
		/* strftime format of a weekday and a date. */
		format = _("%a %m/%d/%Y");
	} else if (use_24_hour_format) {
		if (!show_zero_seconds && date_tm->tm_sec == 0)
			/* strftime format of a weekday, a date and a
			   time, in 24-hour format, without seconds. */
			format = _("%a %m/%d/%Y %H:%M");
		else
			/* strftime format of a weekday, a date and a
			   time, in 24-hour format. */
			format = _("%a %m/%d/%Y %H:%M:%S");
	} else {
		if (!show_zero_seconds && date_tm->tm_sec == 0)
			/* strftime format of a weekday, a date and a
			   time, in 12-hour format, without seconds. */
			format = _("%a %m/%d/%Y %I:%M %p");
		else
			/* strftime format of a weekday, a date and a
			   time, in 12-hour format. */
			format = _("%a %m/%d/%Y %I:%M:%S %p");
	}

	/* strftime returns 0 if the string doesn't fit, and leaves the buffer
	   undefined, so we set it to the empty string in that case. */
	if (e_utf8_strftime (buffer, buffer_size, format, date_tm) == 0)
		buffer[0] = '\0';
}

/**
 * e_time_format_time:
 * @date_tm: The #tm to convert to a string.
 * @use_24_hour_format: A #gboolean.
 * @show_zero_seconds: A #gboolean.
 * @buffer: The #char buffer to store the result in.
 * @buffer_size: The length of @buffer.
 *
 * Creates a string representation of a time value in @date_tm and
 * stores it in @buffer. @buffer_size should be at least 64.
 **/
void
e_time_format_time			(struct tm	*date_tm,
					 gboolean	 use_24_hour_format,
					 gboolean	 show_zero_seconds,
					 gchar		*buffer,
					 gint		 buffer_size)
{
	gchar *format;

	if (use_24_hour_format) {
		if (!show_zero_seconds && date_tm->tm_sec == 0)
			/* strftime format of a time in 24-hour format,
			   without seconds. */
			format = _("%H:%M");
		else
			/* strftime format of a time in 24-hour format. */
			format = _("%H:%M:%S");
	} else {
		if (!show_zero_seconds && date_tm->tm_sec == 0)
			/* strftime format of a time in 12-hour format,
			   without seconds. */
			format = _("%I:%M %p");
		else
			/* strftime format of a time in 12-hour format. */
			format = _("%I:%M:%S %p");
	}

	/* strftime returns 0 if the string doesn't fit, and leaves the buffer
	   undefined, so we set it to the empty string in that case. */
	if (e_utf8_strftime (buffer, buffer_size, format, date_tm) == 0)
		buffer[0] = '\0';
}

/**
 * e_mktime_utc:
 * @tm: The #tm to convert to a calendar time representation.
 *
 * Like mktime(3), but assumes UTC instead of local timezone.
 *
 * Returns: The calendar time representation of @tm.
 **/
time_t
e_mktime_utc (struct tm *tm)
{
	time_t tt;

	tm->tm_isdst = -1;
	tt = mktime (tm);

#if defined (HAVE_TM_GMTOFF)
	tt += tm->tm_gmtoff;
#elif defined (HAVE_TIMEZONE)
	if (tm->tm_isdst > 0) {
  #if defined (HAVE_ALTZONE)
		tt -= altzone;
  #else /* !defined (HAVE_ALTZONE) */
		tt -= (timezone - 3600);
  #endif
	} else
		tt -= timezone;
#endif

	return tt;
}

/**
 * e_localtime_with_offset:
 * @tt: The #time_t to convert.
 * @tm: The #tm to store the result in.
 * @offset: The #int to store the offset in.
 *
 * Converts the calendar time time representation @tt to a broken-down
 * time representation, store in @tm, and provides the offset in
 * seconds from UTC time, stored in @offset.
 **/
void
e_localtime_with_offset (time_t tt, struct tm *tm, gint *offset)
{
	localtime_r (&tt, tm);

#if defined (HAVE_TM_GMTOFF)
	*offset = tm->tm_gmtoff;
#elif defined (HAVE_TIMEZONE)
	if (tm->tm_isdst > 0) {
  #if defined (HAVE_ALTZONE)
		*offset = -altzone;
  #else /* !defined (HAVE_ALTZONE) */
		*offset = -(timezone - 3600);
  #endif
	} else
		*offset = -timezone;
#endif
}

#ifdef G_OS_WIN32
static gint _e_string_replace(gchar **str, const gchar *old, const gchar *new)
{
	GRegex *my_regex = g_regex_new(old, 0, 0, NULL);
	gchar *buf = *str;
	*str = g_regex_replace(my_regex, buf, -1, 0, new, 0, NULL);
	g_free(buf);
	g_regex_unref(my_regex);
    return 0;
}
#endif

/**
 * e_time_get_d_fmt_with_4digit_year:
 *
 * Since: 2.22
 **/
gchar *
e_time_get_d_fmt_with_4digit_year (void)
{
	gchar *p;
	gchar *res = NULL;
#if defined(HAVE_NL_LANGINFO)
	res = g_strdup (nl_langinfo (D_FMT) );
#elif defined(G_OS_WIN32)
  #define GET_LOCALE_INFO(str, len) GetLocaleInfoA(LOCALE_USER_DEFAULT, LOCALE_SLONGDATE, str, len)
	gint format_string_length = GET_LOCALE_INFO(NULL, 0);
	if (format_string_length > 0)
	{
		gsize format_bytes_read, format_bytes_written;
		gchar *format_string = g_strnfill(format_string_length + 1, '\0');
		GET_LOCALE_INFO(format_string, format_string_length);
		res = g_locale_to_utf8(format_string, format_string_length, &format_bytes_read, &format_bytes_written, NULL);
		g_free(format_string);
		/* now, convert the res to format of nl_langinfo */
		_e_string_replace(&res, "\\bd\\b", "%#d");	/* d -> %#d */
		_e_string_replace(&res, "\\bdd\\b", "%d");	/* dd -> %d */
		_e_string_replace(&res, "\\bddd\\b", "%a");	/* ddd -> %a */
		_e_string_replace(&res, "\\bdddd\\b", "%A");	/* dddd -> %A */
		_e_string_replace(&res, "\\bM\\b", "%#m");	/* M -> %#m */
		_e_string_replace(&res, "\\bMM\\b", "%m");	/* MM -> %m */
		_e_string_replace(&res, "\\bMMM\\b", "%b");	/* MMM -> %b */
		_e_string_replace(&res, "\\bMMMM\\b", "%B");	/* MMMM -> %B */
		_e_string_replace(&res, "\\by\\b", "%#y");	/* y -> %y */
		_e_string_replace(&res, "\\byy\\b", "%y");	/* yy -> %y*/
		_e_string_replace(&res, "\\byyyy\\b", "%Y");	/* yyyy -> %Y */
		_e_string_replace(&res, "\\byyyyy\\b", "%Y");	/* yyyyy -> %Y */
	}
  #undef GET_LOCALE_INFO
	/**TODO** implement this for other systems
	*/
#else
		/* this will not work for other systems */
	res = g_strdup ("%x");
#endif

	while (p = strchr (res, 'y'), p)
		*p = 'Y';

	return res;
}

