Moved time functions to date.c

-/* Copyright (C) 2001 Free Software Foundation, Inc.
-   A wrapper for mktime function allowing to specify the timezone.
+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
 
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
 
-   The GNU C Library is distributed in the hope that it will be useful,
+   This program 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
-   Library General Public License for more details.
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Library General Public License for more details.
 
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #if HAVE_CONFIG_H
 # include <config.h>
@@ -83,181 +82,6 @@ mu_hexstr2ul (unsigned long *ul, const char *hex, size_t len)
   return r;
 }
 
-/* Convert struct tm into time_t, taking into account timezone offset.
-
- mktime() always treats tm as if it was localtime, so convert it
- to UTC, then adjust by the tm's real timezone, if it is known.
-
- NOTE: 1. mktime converts localtime struct tm to *time_t in UTC*
-       2. adding mu_utc_offset() compensates for the localtime
-          corrections in mktime(), i.e. it yields the time_t in
-	  the current zone of struct tm.
-       3. finally, subtracting TZ offset yields the UTC.
-*/
-time_t
-mu_tm2time (struct tm *timeptr, mu_timezone* tz)
-{
-  int offset = tz ? tz->utc_offset : 0;
-
-  return mktime (timeptr) + mu_utc_offset () - offset;
-}
-
-/* Convert time 0 at UTC to our localtime, that tells us the offset
-   of our current timezone from UTC. */
-time_t
-mu_utc_offset (void)
-{
-  time_t t = 0;
-  struct tm* tm = gmtime (&t);
-
-  return - mktime (tm);
-}
-
-static const char *months[] =
-{
-  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
-  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", NULL
-};
-
-static const char *wdays[] =
-{
-  "Sun", "Mon", "Teu", "Wed", "Thr", "Fri", "Sat", NULL
-};
-
-int
-mu_parse_imap_date_time (const char **p, struct tm *tm, mu_timezone *tz)
-{
-  int year, mon, day, hour, min, sec;
-  char zone[6] = "+0000";	/* ( "+" / "-" ) hhmm */
-  char month[5] = "";
-  int hh = 0;
-  int mm = 0;
-  int sign = 1;
-  int scanned = 0, scanned3;
-  int i;
-  int tzoffset;
-
-  day = mon = year = hour = min = sec = 0;
-
-  memset (tm, 0, sizeof (*tm));
-
-  switch (sscanf (*p,
-		  "%2d-%3s-%4d%n %2d:%2d:%2d %5s%n",
-		  &day, month, &year, &scanned3, &hour, &min, &sec, zone,
-		  &scanned))
-    {
-    case 3:
-      scanned = scanned3;
-      break;
-    case 7:
-      break;
-    default:
-      return -1;
-    }
-
-  tm->tm_sec = sec;
-  tm->tm_min = min;
-  tm->tm_hour = hour;
-  tm->tm_mday = day;
-
-  for (i = 0; i < 12; i++)
-    {
-      if (strncasecmp (month, months[i], 3) == 0)
-	{
-	  mon = i;
-	  break;
-	}
-    }
-  tm->tm_mon = mon;
-  tm->tm_year = (year > 1900) ? year - 1900 : year;
-  tm->tm_yday = 0;		/* unknown. */
-  tm->tm_wday = 0;		/* unknown. */
-#if HAVE_STRUCT_TM_TM_ISDST
-  tm->tm_isdst = -1;		/* unknown. */
-#endif
-
-  hh = (zone[1] - '0') * 10 + (zone[2] - '0');
-  mm = (zone[3] - '0') * 10 + (zone[4] - '0');
-  sign = (zone[0] == '-') ? -1 : +1;
-  tzoffset = sign * (hh * 60 * 60 + mm * 60);
-
-#if HAVE_STRUCT_TM_TM_GMTOFF
-  tm->tm_gmtoff = tzoffset;
-#endif
-
-  if (tz)
-    {
-      tz->utc_offset = tzoffset;
-      tz->tz_name = NULL;
-    }
-
-  *p += scanned;
-
-  return 0;
-}
-
-/* "ctime" format is: Thu Jul 01 15:58:27 1999, with no trailing \n.  */
-int
-mu_parse_ctime_date_time (const char **p, struct tm *tm, mu_timezone * tz)
-{
-  int wday = 0;
-  int year = 0;
-  int mon = 0;
-  int day = 0;
-  int hour = 0;
-  int min = 0;
-  int sec = 0;
-  int n = 0;
-  int i;
-  char weekday[5] = "";
-  char month[5] = "";
-
-  if (sscanf (*p, "%3s %3s %2d %2d:%2d:%2d %d%n\n",
-	weekday, month, &day, &hour, &min, &sec, &year, &n) != 7)
-    return -1;
-
-  *p += n;
-
-  for (i = 0; i < 7; i++)
-    {
-      if (strncasecmp (weekday, wdays[i], 3) == 0)
-	{
-	  wday = i;
-	  break;
-	}
-    }
-
-  for (i = 0; i < 12; i++)
-    {
-      if (strncasecmp (month, months[i], 3) == 0)
-	{
-	  mon = i;
-	  break;
-	}
-    }
-
-  if (tm)
-    {
-      memset (tm, 0, sizeof (struct tm));
-
-      tm->tm_sec = sec;
-      tm->tm_min = min;
-      tm->tm_hour = hour;
-      tm->tm_mday = day;
-      tm->tm_wday = wday;
-      tm->tm_mon = mon;
-      tm->tm_year = (year > 1900) ? year - 1900 : year;
-#ifdef HAVE_STRUCT_TM_TM_ISDST
-      tm->tm_isdst = -1;	/* unknown. */
-#endif
-    }
-
-  /* ctime has no timezone information, set tz to UTC if they ask. */
-  if (tz)
-    memset (tz, 0, sizeof (struct mu_timezone));
-
-  return 0;
-}
 
 char *
 mu_get_homedir (void)