glib/gtimezone.h

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  *
   4  * This library is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * licence, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  *
  19  * Author: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  23 #error "Only <glib.h> can be included directly."
  24 #endif
  25
  26 #ifndef __G_TIME_ZONE_H__
  27 #define __G_TIME_ZONE_H__
  28
  29 #include <glib/gtypes.h>
  30
  31 G_BEGIN_DECLS
  32
  33 typedef struct _GTimeZone GTimeZone;
  34
  35 /**
  36  * GTimeType:
  37  * @G_TIME_TYPE_STANDARD: the time is in local standard time
  38  * @G_TIME_TYPE_DAYLIGHT: the time is in local daylight time
  39  * @G_TIME_TYPE_UNIVERSAL: the time is in UTC
  40  *
  41  * Disambiguates a given time in two ways.
  42  *
  43  * First, specifies if the given time is in universal or local time.
  44  *
  45  * Second, if the time is in local time, specifies if it is local
  46  * standard time or local daylight time.  This is important for the case
  47  * where the same local time occurs twice (during daylight savings time
  48  * transitions, for example).
  49  */
  50 typedef enum
  51 {
  52   G_TIME_TYPE_STANDARD,
  53   G_TIME_TYPE_DAYLIGHT,
  54   G_TIME_TYPE_UNIVERSAL
  55 } GTimeType;
  56
  57 GTimeZone *             g_time_zone_new                                 (const gchar *identifier);
  58 GTimeZone *             g_time_zone_new_utc                             (void);
  59 GTimeZone *             g_time_zone_new_local                           (void);
  60
  61 GTimeZone *             g_time_zone_ref                                 (GTimeZone   *tz);
  62 void                    g_time_zone_unref                               (GTimeZone   *tz);
  63
  64 gint                    g_time_zone_find_interval                       (GTimeZone   *tz,
  65                                                                          GTimeType    type,
  66                                                                          gint64       time_);
  67
  68 gint                    g_time_zone_adjust_time                         (GTimeZone   *tz,
  69                                                                          GTimeType    type,
  70                                                                          gint64      *time_);
  71
  72 const gchar *           g_time_zone_get_abbreviation                    (GTimeZone   *tz,
  73                                                                          gint         interval);
  74 gint32                  g_time_zone_get_offset                          (GTimeZone   *tz,
  75                                                                          gint         interval);
  76 gboolean                g_time_zone_is_dst                              (GTimeZone   *tz,
  77                                                                          gint         interval);
  78
  79 G_END_DECLS
  80
  81 #endif /* __G_TIME_ZONE_H__ */