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/* Miscellaneous time-related utilities
*
* Copyright (C) 1998 The Free Software Foundation
* Copyright (C) 2000 Ximian, Inc.
*
* Authors: Federico Mena <federico@ximian.com>
* Miguel de Icaza <miguel@ximian.com>
* Damon Chaplin <damon@ximian.com>
*/
#ifndef TIMEUTIL_H
#define TIMEUTIL_H
#include <time.h>
#include <ical.h>
#include <glib.h>
/**************************************************************************
* General time functions.
**************************************************************************/
/* Returns the number of days in the month. Year is the normal year, e.g. 2001.
Month is 0 (Jan) to 11 (Dec). */
int time_days_in_month (int year, int month);
/* Returns the 1-based day number within the year of the specified date.
Year is the normal year, e.g. 2001. Month is 0 to 11. */
int time_day_of_year (int day, int month, int year);
/* Returns the day of the week for the specified date, 0 (Sun) to 6 (Sat).
For the days that were removed on the Gregorian reformation, it returns
Thursday. Year is the normal year, e.g. 2001. Month is 0 to 11. */
int time_day_of_week (int day, int month, int year);
/* Returns whether the specified year is a leap year. Year is the normal year,
e.g. 2001. */
gboolean time_is_leap_year (int year);
/* Returns the number of leap years since year 1 up to (but not including) the
specified year. Year is the normal year, e.g. 2001. */
int time_leap_years_up_to (int year);
/* Convert to or from an ISO 8601 representation of a time, in UTC,
e.g. "20010708T183000Z". */
char *isodate_from_time_t (time_t t);
time_t time_from_isodate (const char *str);
/**************************************************************************
* time_t manipulation functions.
*
* NOTE: these use the Unix timezone functions like mktime() and localtime()
* and so should not be used in Evolution. New Evolution code should use
* icaltimetype values rather than time_t values wherever possible.
**************************************************************************/
/* Add or subtract a number of days, weeks or months. */
time_t time_add_day (time_t time, int days);
time_t time_add_week (time_t time, int weeks);
time_t time_add_month (time_t time, int months);
/* Returns the beginning of the year or month. */
time_t time_year_begin (time_t t);
time_t time_month_begin (time_t t);
/* Returns the beginning of the week. week_start_day should use the same values
as mktime(), i.e. 0 (Sun) to 6 (Sat). */
time_t time_week_begin (time_t t, int week_start_day);
/* Returns the beginning or end of the day. */
time_t time_day_begin (time_t t);
time_t time_day_end (time_t t);
/**************************************************************************
* time_t manipulation functions, using timezones in libical.
*
* NOTE: these are only here to make the transition to the timezone
* functions easier. New code should use icaltimetype values rather than
* time_t values wherever possible.
**************************************************************************/
/* Adds or subtracts a number of days to/from the given time_t value, using
the given timezone. */
time_t time_add_day_with_zone (time_t time, int days, icaltimezone *zone);
/* Adds or subtracts a number of weeks to/from the given time_t value, using
the given timezone. */
time_t time_add_week_with_zone (time_t time, int weeks, icaltimezone *zone);
/* Adds or subtracts a number of months to/from the given time_t value, using
the given timezone. */
time_t time_add_month_with_zone (time_t time, int months, icaltimezone *zone);
/* Returns the start of the year containing the given time_t, using the given
timezone. */
time_t time_year_begin_with_zone (time_t time, icaltimezone *zone);
/* Returns the start of the month containing the given time_t, using the given
timezone. */
time_t time_month_begin_with_zone (time_t time, icaltimezone *zone);
/* Returns the start of the week containing the given time_t, using the given
timezone. week_start_day should use the same values as mktime(),
i.e. 0 (Sun) to 6 (Sat). */
time_t time_week_begin_with_zone (time_t time, int week_start_day,
icaltimezone *zone);
/* Returns the start of the day containing the given time_t, using the given
timezone. */
time_t time_day_begin_with_zone (time_t time, icaltimezone *zone);
/* Returns the end of the day containing the given time_t, using the given
timezone. (The end of the day is the start of the next day.) */
time_t time_day_end_with_zone (time_t time, icaltimezone *zone);
#endif
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