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gdatetime.c
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gdatetime.c
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/* gdatetime.c
*
* Copyright (C) 2009-2010 Christian Hergert <chris@dronelabs.com>
* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
* Copyright (C) 2010 Emmanuele Bassi <ebassi@linux.intel.com>
* Copyright © 2010 Codethink Limited
*
* This 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
* licence, or (at your option) any later version.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA.
*
* Authors: Christian Hergert <chris@dronelabs.com>
* Thiago Santos <thiago.sousa.santos@collabora.co.uk>
* Emmanuele Bassi <ebassi@linux.intel.com>
* Ryan Lortie <desrt@desrt.ca>
*/
/* Algorithms within this file are based on the Calendar FAQ by
* Claus Tondering. It can be found at
* http://www.tondering.dk/claus/cal/calendar29.txt
*
* Copyright and disclaimer
* ------------------------
* This document is Copyright (C) 2008 by Claus Tondering.
* E-mail: claus@tondering.dk. (Please include the word
* "calendar" in the subject line.)
* The document may be freely distributed, provided this
* copyright notice is included and no money is charged for
* the document.
*
* This document is provided "as is". No warranties are made as
* to its correctness.
*/
/* Prologue {{{1 */
#include "config.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_LANGINFO_TIME
#include <langinfo.h>
#endif
#include "gdatetime.h"
#include "gslice.h"
#include "gatomic.h"
#include "gcharset.h"
#include "gconvert.h"
#include "gfileutils.h"
#include "ghash.h"
#include "gmain.h"
#include "gmappedfile.h"
#include "gstrfuncs.h"
#include "gtestutils.h"
#include "gthread.h"
#include "gtimezone.h"
#include "glibintl.h"
#ifndef G_OS_WIN32
#include <sys/time.h>
#include <time.h>
#endif /* !G_OS_WIN32 */
/**
* SECTION:date-time
* @title: GDateTime
* @short_description: a structure representing Date and Time
* @see_also: #GTimeZone
*
* #GDateTime is a structure that combines a Gregorian date and time
* into a single structure. It provides many conversion and methods to
* manipulate dates and times. Time precision is provided down to
* microseconds and the time can range (proleptically) from 0001-01-01
* 00:00:00 to 9999-12-31 23:59:59.999999. #GDateTime follows POSIX
* time in the sense that it is oblivious to leap seconds.
*
* #GDateTime is an immutable object; once it has been created it cannot
* be modified further. All modifiers will create a new #GDateTime.
* Nearly all such functions can fail due to the date or time going out
* of range, in which case %NULL will be returned.
*
* #GDateTime is reference counted: the reference count is increased by calling
* g_date_time_ref() and decreased by calling g_date_time_unref(). When the
* reference count drops to 0, the resources allocated by the #GDateTime
* structure are released.
*
* Many parts of the API may produce non-obvious results. As an
* example, adding two months to January 31st will yield March 31st
* whereas adding one month and then one month again will yield either
* March 28th or March 29th. Also note that adding 24 hours is not
* always the same as adding one day (since days containing daylight
* savings time transitions are either 23 or 25 hours in length).
*
* #GDateTime is available since GLib 2.26.
*/
struct _GDateTime
{
/* 1 is 0001-01-01 in Proleptic Gregorian */
gint32 days;
/* Microsecond timekeeping within Day */
guint64 usec;
/* TimeZone information */
GTimeZone *tz;
gint interval;
volatile gint ref_count;
};
/* Time conversion {{{1 */
#define UNIX_EPOCH_START 719163
#define INSTANT_TO_UNIX(instant) \
((instant)/USEC_PER_SECOND - UNIX_EPOCH_START * SEC_PER_DAY)
#define UNIX_TO_INSTANT(unix) \
(((unix) + UNIX_EPOCH_START * SEC_PER_DAY) * USEC_PER_SECOND)
#define DAYS_IN_4YEARS 1461 /* days in 4 years */
#define DAYS_IN_100YEARS 36524 /* days in 100 years */
#define DAYS_IN_400YEARS 146097 /* days in 400 years */
#define USEC_PER_SECOND (G_GINT64_CONSTANT (1000000))
#define USEC_PER_MINUTE (G_GINT64_CONSTANT (60000000))
#define USEC_PER_HOUR (G_GINT64_CONSTANT (3600000000))
#define USEC_PER_MILLISECOND (G_GINT64_CONSTANT (1000))
#define USEC_PER_DAY (G_GINT64_CONSTANT (86400000000))
#define SEC_PER_DAY (G_GINT64_CONSTANT (86400))
#define SECS_PER_MINUTE (60)
#define SECS_PER_HOUR (60 * SECS_PER_MINUTE)
#define SECS_PER_DAY (24 * SECS_PER_HOUR)
#define SECS_PER_YEAR (365 * SECS_PER_DAY)
#define SECS_PER_JULIAN (DAYS_PER_PERIOD * SECS_PER_DAY)
#define GREGORIAN_LEAP(y) ((((y) % 4) == 0) && (!((((y) % 100) == 0) && (((y) % 400) != 0))))
#define JULIAN_YEAR(d) ((d)->julian / 365.25)
#define DAYS_PER_PERIOD (G_GINT64_CONSTANT (2914695))
static const guint16 days_in_months[2][13] =
{
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
static const guint16 days_in_year[2][13] =
{
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
#ifdef HAVE_LANGINFO_TIME
#define GET_AMPM(d) ((g_date_time_get_hour (d) < 12) ? \
nl_langinfo (AM_STR) : \
nl_langinfo (PM_STR))
#define PREFERRED_DATE_TIME_FMT nl_langinfo (D_T_FMT)
#define PREFERRED_DATE_FMT nl_langinfo (D_FMT)
#define PREFERRED_TIME_FMT nl_langinfo (T_FMT)
#define PREFERRED_TIME_FMT nl_langinfo (T_FMT)
#define PREFERRED_12HR_TIME_FMT nl_langinfo (T_FMT_AMPM)
static const gint weekday_item[2][7] =
{
{ ABDAY_2, ABDAY_3, ABDAY_4, ABDAY_5, ABDAY_6, ABDAY_7, ABDAY_1 },
{ DAY_2, DAY_3, DAY_4, DAY_5, DAY_6, DAY_7, DAY_1 }
};
static const gint month_item[2][12] =
{
{ ABMON_1, ABMON_2, ABMON_3, ABMON_4, ABMON_5, ABMON_6, ABMON_7, ABMON_8, ABMON_9, ABMON_10, ABMON_11, ABMON_12 },
{ MON_1, MON_2, MON_3, MON_4, MON_5, MON_6, MON_7, MON_8, MON_9, MON_10, MON_11, MON_12 },
};
#define WEEKDAY_ABBR(d) nl_langinfo (weekday_item[0][g_date_time_get_day_of_week (d) - 1])
#define WEEKDAY_FULL(d) nl_langinfo (weekday_item[1][g_date_time_get_day_of_week (d) - 1])
#define MONTH_ABBR(d) nl_langinfo (month_item[0][g_date_time_get_month (d) - 1])
#define MONTH_FULL(d) nl_langinfo (month_item[1][g_date_time_get_month (d) - 1])
#else
#define GET_AMPM(d) ((g_date_time_get_hour (d) < 12) \
/* Translators: 'before midday' indicator */ \
? C_("GDateTime", "AM") \
/* Translators: 'after midday' indicator */ \
: C_("GDateTime", "PM"))
/* Translators: this is the preferred format for expressing the date and the time */
#define PREFERRED_DATE_TIME_FMT C_("GDateTime", "%a %b %e %H:%M:%S %Y")
/* Translators: this is the preferred format for expressing the date */
#define PREFERRED_DATE_FMT C_("GDateTime", "%m/%d/%y")
/* Translators: this is the preferred format for expressing the time */
#define PREFERRED_TIME_FMT C_("GDateTime", "%H:%M:%S")
/* Translators: this is the preferred format for expressing 12 hour time */
#define PREFERRED_12HR_TIME_FMT C_("GDateTime", "%I:%M:%S %p")
#define WEEKDAY_ABBR(d) (get_weekday_name_abbr (g_date_time_get_day_of_week (d)))
#define WEEKDAY_FULL(d) (get_weekday_name (g_date_time_get_day_of_week (d)))
#define MONTH_ABBR(d) (get_month_name_abbr (g_date_time_get_month (d)))
#define MONTH_FULL(d) (get_month_name (g_date_time_get_month (d)))
static const gchar *
get_month_name (gint month)
{
switch (month)
{
case 1:
return C_("full month name", "January");
case 2:
return C_("full month name", "February");
case 3:
return C_("full month name", "March");
case 4:
return C_("full month name", "April");
case 5:
return C_("full month name", "May");
case 6:
return C_("full month name", "June");
case 7:
return C_("full month name", "July");
case 8:
return C_("full month name", "August");
case 9:
return C_("full month name", "September");
case 10:
return C_("full month name", "October");
case 11:
return C_("full month name", "November");
case 12:
return C_("full month name", "December");
default:
g_warning ("Invalid month number %d", month);
}
return NULL;
}
static const gchar *
get_month_name_abbr (gint month)
{
switch (month)
{
case 1:
return C_("abbreviated month name", "Jan");
case 2:
return C_("abbreviated month name", "Feb");
case 3:
return C_("abbreviated month name", "Mar");
case 4:
return C_("abbreviated month name", "Apr");
case 5:
return C_("abbreviated month name", "May");
case 6:
return C_("abbreviated month name", "Jun");
case 7:
return C_("abbreviated month name", "Jul");
case 8:
return C_("abbreviated month name", "Aug");
case 9:
return C_("abbreviated month name", "Sep");
case 10:
return C_("abbreviated month name", "Oct");
case 11:
return C_("abbreviated month name", "Nov");
case 12:
return C_("abbreviated month name", "Dec");
default:
g_warning ("Invalid month number %d", month);
}
return NULL;
}
static const gchar *
get_weekday_name (gint day)
{
switch (day)
{
case 1:
return C_("full weekday name", "Monday");
case 2:
return C_("full weekday name", "Tuesday");
case 3:
return C_("full weekday name", "Wednesday");
case 4:
return C_("full weekday name", "Thursday");
case 5:
return C_("full weekday name", "Friday");
case 6:
return C_("full weekday name", "Saturday");
case 7:
return C_("full weekday name", "Sunday");
default:
g_warning ("Invalid week day number %d", day);
}
return NULL;
}
static const gchar *
get_weekday_name_abbr (gint day)
{
switch (day)
{
case 1:
return C_("abbreviated weekday name", "Mon");
case 2:
return C_("abbreviated weekday name", "Tue");
case 3:
return C_("abbreviated weekday name", "Wed");
case 4:
return C_("abbreviated weekday name", "Thu");
case 5:
return C_("abbreviated weekday name", "Fri");
case 6:
return C_("abbreviated weekday name", "Sat");
case 7:
return C_("abbreviated weekday name", "Sun");
default:
g_warning ("Invalid week day number %d", day);
}
return NULL;
}
#endif /* HAVE_LANGINFO_TIME */
static inline gint
ymd_to_days (gint year,
gint month,
gint day)
{
gint64 days;
days = (year - 1) * 365 + ((year - 1) / 4) - ((year - 1) / 100)
+ ((year - 1) / 400);
days += days_in_year[0][month - 1];
if (GREGORIAN_LEAP (year) && month > 2)
day++;
days += day;
return days;
}
static void
g_date_time_get_week_number (GDateTime *datetime,
gint *week_number,
gint *day_of_week,
gint *day_of_year)
{
gint a, b, c, d, e, f, g, n, s, month, day, year;
g_date_time_get_ymd (datetime, &year, &month, &day);
if (month <= 2)
{
a = g_date_time_get_year (datetime) - 1;
b = (a / 4) - (a / 100) + (a / 400);
c = ((a - 1) / 4) - ((a - 1) / 100) + ((a - 1) / 400);
s = b - c;
e = 0;
f = day - 1 + (31 * (month - 1));
}
else
{
a = year;
b = (a / 4) - (a / 100) + (a / 400);
c = ((a - 1) / 4) - ((a - 1) / 100) + ((a - 1) / 400);
s = b - c;
e = s + 1;
f = day + (((153 * (month - 3)) + 2) / 5) + 58 + s;
}
g = (a + b) % 7;
d = (f + g - e) % 7;
n = f + 3 - d;
if (week_number)
{
if (n < 0)
*week_number = 53 - ((g - s) / 5);
else if (n > 364 + s)
*week_number = 1;
else
*week_number = (n / 7) + 1;
}
if (day_of_week)
*day_of_week = d + 1;
if (day_of_year)
*day_of_year = f + 1;
}
/* Lifecycle {{{1 */
static GDateTime *
g_date_time_alloc (GTimeZone *tz)
{
GDateTime *datetime;
datetime = g_slice_new0 (GDateTime);
datetime->tz = g_time_zone_ref (tz);
datetime->ref_count = 1;
return datetime;
}
/**
* g_date_time_ref:
* @datetime: a #GDateTime
*
* Atomically increments the reference count of @datetime by one.
*
* Return value: the #GDateTime with the reference count increased
*
* Since: 2.26
*/
GDateTime *
g_date_time_ref (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, NULL);
g_return_val_if_fail (datetime->ref_count > 0, NULL);
g_atomic_int_inc (&datetime->ref_count);
return datetime;
}
/**
* g_date_time_unref:
* @datetime: a #GDateTime
*
* Atomically decrements the reference count of @datetime by one.
*
* When the reference count reaches zero, the resources allocated by
* @datetime are freed
*
* Since: 2.26
*/
void
g_date_time_unref (GDateTime *datetime)
{
g_return_if_fail (datetime != NULL);
g_return_if_fail (datetime->ref_count > 0);
if (g_atomic_int_dec_and_test (&datetime->ref_count))
{
g_time_zone_unref (datetime->tz);
g_slice_free (GDateTime, datetime);
}
}
/* Internal state transformers {{{1 */
/*< internal >
* g_date_time_to_instant:
* @datetime: a #GDateTime
*
* Convert a @datetime into an instant.
*
* An instant is a number that uniquely describes a particular
* microsecond in time, taking time zone considerations into account.
* (ie: "03:00 -0400" is the same instant as "02:00 -0500").
*
* An instant is always positive but we use a signed return value to
* avoid troubles with C.
*/
static gint64
g_date_time_to_instant (GDateTime *datetime)
{
gint64 offset;
offset = g_time_zone_get_offset (datetime->tz, datetime->interval);
offset *= USEC_PER_SECOND;
return datetime->days * USEC_PER_DAY + datetime->usec - offset;
}
/*< internal >
* g_date_time_from_instant:
* @tz: a #GTimeZone
* @instant: a instant in time
*
* Creates a #GDateTime from a time zone and an instant.
*
* This might fail if the time ends up being out of range.
*/
static GDateTime *
g_date_time_from_instant (GTimeZone *tz,
gint64 instant)
{
GDateTime *datetime;
gint64 offset;
if (instant < 0 || instant > G_GINT64_CONSTANT (1000000000000000000))
return NULL;
datetime = g_date_time_alloc (tz);
datetime->interval = g_time_zone_find_interval (tz,
G_TIME_TYPE_UNIVERSAL,
INSTANT_TO_UNIX (instant));
offset = g_time_zone_get_offset (datetime->tz, datetime->interval);
offset *= USEC_PER_SECOND;
instant += offset;
datetime->days = instant / USEC_PER_DAY;
datetime->usec = instant % USEC_PER_DAY;
if (datetime->days < 1 || 3652059 < datetime->days)
{
g_date_time_unref (datetime);
datetime = NULL;
}
return datetime;
}
/*< internal >
* g_date_time_deal_with_date_change:
* @datetime: a #GDateTime
*
* This function should be called whenever the date changes by adding
* days, months or years. It does three things.
*
* First, we ensure that the date falls between 0001-01-01 and
* 9999-12-31 and return %FALSE if it does not.
*
* Next we update the ->interval field.
*
* Finally, we ensure that the resulting date and time pair exists (by
* ensuring that our time zone has an interval containing it) and
* adjusting as required. For example, if we have the time 02:30:00 on
* March 13 2010 in Toronto and we add 1 day to it, we would end up with
* 2:30am on March 14th, which doesn't exist. In that case, we bump the
* time up to 3:00am.
*/
static gboolean
g_date_time_deal_with_date_change (GDateTime *datetime)
{
GTimeType was_dst;
gint64 full_time;
gint64 usec;
if (datetime->days < 1 || datetime->days > 3652059)
return FALSE;
was_dst = g_time_zone_is_dst (datetime->tz, datetime->interval);
full_time = datetime->days * USEC_PER_DAY + datetime->usec;
usec = full_time % USEC_PER_SECOND;
full_time /= USEC_PER_SECOND;
full_time -= UNIX_EPOCH_START * SEC_PER_DAY;
datetime->interval = g_time_zone_adjust_time (datetime->tz,
was_dst,
&full_time);
full_time += UNIX_EPOCH_START * SEC_PER_DAY;
full_time *= USEC_PER_SECOND;
full_time += usec;
datetime->days = full_time / USEC_PER_DAY;
datetime->usec = full_time % USEC_PER_DAY;
/* maybe daylight time caused us to shift to a different day,
* but it definitely didn't push us into a different year */
return TRUE;
}
static GDateTime *
g_date_time_replace_days (GDateTime *datetime,
gint days)
{
GDateTime *new;
new = g_date_time_alloc (datetime->tz);
new->interval = datetime->interval;
new->usec = datetime->usec;
new->days = days;
if (!g_date_time_deal_with_date_change (new))
{
g_date_time_unref (new);
new = NULL;
}
return new;
}
/* now/unix/timeval Constructors {{{1 */
/*< internal >
* g_date_time_new_from_timeval:
* @tz: a #GTimeZone
* @tv: a #GTimeVal
*
* Creates a #GDateTime corresponding to the given #GTimeVal @tv in the
* given time zone @tz.
*
* The time contained in a #GTimeVal is always stored in the form of
* seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the
* given time zone.
*
* This call can fail (returning %NULL) if @tv represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
static GDateTime *
g_date_time_new_from_timeval (GTimeZone *tz,
const GTimeVal *tv)
{
return g_date_time_from_instant (tz, tv->tv_usec +
UNIX_TO_INSTANT (tv->tv_sec));
}
/*< internal >
* g_date_time_new_from_unix:
* @tz: a #GTimeZone
* @t: the Unix time
*
* Creates a #GDateTime corresponding to the given Unix time @t in the
* given time zone @tz.
*
* Unix time is the number of seconds that have elapsed since 1970-01-01
* 00:00:00 UTC, regardless of the time zone given.
*
* This call can fail (returning %NULL) if @t represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
static GDateTime *
g_date_time_new_from_unix (GTimeZone *tz,
gint64 secs)
{
return g_date_time_from_instant (tz, UNIX_TO_INSTANT (secs));
}
/**
* g_date_time_new_now:
* @tz: a #GTimeZone
*
* Creates a #GDateTime corresponding to this exact instant in the given
* time zone @tz. The time is as accurate as the system allows, to a
* maximum accuracy of 1 microsecond.
*
* This function will always succeed unless the system clock is set to
* truly insane values (or unless GLib is still being used after the
* year 9999).
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_now (GTimeZone *tz)
{
GTimeVal tv;
g_get_current_time (&tv);
return g_date_time_new_from_timeval (tz, &tv);
}
/**
* g_date_time_new_now_local:
*
* Creates a #GDateTime corresponding to this exact instant in the local
* time zone.
*
* This is equivalent to calling g_date_time_new_now() with the time
* zone returned by g_time_zone_new_local().
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_now_local (void)
{
GDateTime *datetime;
GTimeZone *local;
local = g_time_zone_new_local ();
datetime = g_date_time_new_now (local);
g_time_zone_unref (local);
return datetime;
}
/**
* g_date_time_new_now_utc:
*
* Creates a #GDateTime corresponding to this exact instant in UTC.
*
* This is equivalent to calling g_date_time_new_now() with the time
* zone returned by g_time_zone_new_utc().
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_now_utc (void)
{
GDateTime *datetime;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
datetime = g_date_time_new_now (utc);
g_time_zone_unref (utc);
return datetime;
}
/**
* g_date_time_new_from_unix_local:
* @t: the Unix time
*
* Creates a #GDateTime corresponding to the given Unix time @t in the
* local time zone.
*
* Unix time is the number of seconds that have elapsed since 1970-01-01
* 00:00:00 UTC, regardless of the local time offset.
*
* This call can fail (returning %NULL) if @t represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_unix_local (gint64 t)
{
GDateTime *datetime;
GTimeZone *local;
local = g_time_zone_new_local ();
datetime = g_date_time_new_from_unix (local, t);
g_time_zone_unref (local);
return datetime;
}
/**
* g_date_time_new_from_unix_utc:
* @t: the Unix time
*
* Creates a #GDateTime corresponding to the given Unix time @t in UTC.
*
* Unix time is the number of seconds that have elapsed since 1970-01-01
* 00:00:00 UTC.
*
* This call can fail (returning %NULL) if @t represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_unix_utc (gint64 t)
{
GDateTime *datetime;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
datetime = g_date_time_new_from_unix (utc, t);
g_time_zone_unref (utc);
return datetime;
}
/**
* g_date_time_new_from_timeval_local:
* @tv: a #GTimeVal
*
* Creates a #GDateTime corresponding to the given #GTimeVal @tv in the
* local time zone.
*
* The time contained in a #GTimeVal is always stored in the form of
* seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the
* local time offset.
*
* This call can fail (returning %NULL) if @tv represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_timeval_local (const GTimeVal *tv)
{
GDateTime *datetime;
GTimeZone *local;
local = g_time_zone_new_local ();
datetime = g_date_time_new_from_timeval (local, tv);
g_time_zone_unref (local);
return datetime;
}
/**
* g_date_time_new_from_timeval_utc:
* @tv: a #GTimeVal
*
* Creates a #GDateTime corresponding to the given #GTimeVal @tv in UTC.
*
* The time contained in a #GTimeVal is always stored in the form of
* seconds elapsed since 1970-01-01 00:00:00 UTC.
*
* This call can fail (returning %NULL) if @tv represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_timeval_utc (const GTimeVal *tv)
{
GDateTime *datetime;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
datetime = g_date_time_new_from_timeval (utc, tv);
g_time_zone_unref (utc);
return datetime;
}
/* full new functions {{{1 */
/**
* g_date_time_new:
* @tz: a #GTimeZone
* @year: the year component of the date
* @month: the month component of the date
* @day: the day component of the date
* @hour: the hour component of the date
* @minute: the minute component of the date
* @seconds: the number of seconds past the minute
*
* Creates a new #GDateTime corresponding to the given date and time in
* the time zone @tz.
*
* The @year must be between 1 and 9999, @month between 1 and 12 and @day
* between 1 and 28, 29, 30 or 31 depending on the month and the year.
*
* @hour must be between 0 and 23 and @minute must be between 0 and 59.
*
* @seconds must be at least 0.0 and must be strictly less than 60.0.
* It will be rounded down to the nearest microsecond.
*
* If the given time is not representable in the given time zone (for
* example, 02:30 on March 14th 2010 in Toronto, due to daylight savings
* time) then the time will be rounded up to the nearest existing time
* (in this case, 03:00). If this matters to you then you should verify
* the return value for containing the same as the numbers you gave.
*
* In the case that the given time is ambiguous in the given time zone
* (for example, 01:30 on November 7th 2010 in Toronto, due to daylight
* savings time) then the time falling within standard (ie:
* non-daylight) time is taken.
*
* It not considered a programmer error for the values to this function
* to be out of range, but in the case that they are, the function will
* return %NULL.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new (GTimeZone *tz,
gint year,
gint month,
gint day,
gint hour,
gint minute,
gdouble seconds)
{
GDateTime *datetime;
gint64 full_time;
datetime = g_date_time_alloc (tz);
datetime->days = ymd_to_days (year, month, day);
datetime->usec = (hour * USEC_PER_HOUR)
+ (minute * USEC_PER_MINUTE)
+ (gint64) (seconds * USEC_PER_SECOND);
full_time = SEC_PER_DAY *
(ymd_to_days (year, month, day) - UNIX_EPOCH_START) +
SECS_PER_HOUR * hour +
SECS_PER_MINUTE * minute +
(int) seconds;
datetime->interval = g_time_zone_adjust_time (datetime->tz,
G_TIME_TYPE_STANDARD,
&full_time);
full_time += UNIX_EPOCH_START * SEC_PER_DAY;
datetime->days = full_time / SEC_PER_DAY;
datetime->usec = (full_time % SEC_PER_DAY) * USEC_PER_SECOND;
datetime->usec += ((int) (seconds * USEC_PER_SECOND)) % USEC_PER_SECOND;
return datetime;
}
/**
* g_date_time_new_local:
* @year: the year component of the date
* @month: the month component of the date
* @day: the day component of the date
* @hour: the hour component of the date
* @minute: the minute component of the date
* @seconds: the number of seconds past the minute
*
* Creates a new #GDateTime corresponding to the given date and time in
* the local time zone.
*
* This call is equivalent to calling g_date_time_new() with the time
* zone returned by g_time_zone_new_local().
*
* Returns: a #GDateTime, or %NULL
*
* Since: 2.26.
**/
GDateTime *
g_date_time_new_local (gint year,
gint month,
gint day,
gint hour,
gint minute,
gdouble seconds)