the day of the day-month-year representation of the date, as a number between 1 and 31
this is set if day, month and year are valid
this bit is set if julian_days is valid
the Julian representation of the date
the day of the day-month-year representation of the date, as a number between 1 and 12
the day of the day-month-year representation of the date
Increments a date some number of days. To move forward by weeks, add weeks*7 days. The date must be valid.
number of days to move the date forward
Increments a date by some number of months. If the day of the month is greater than 28, this routine may change the day of the month (because the destination month may not have the current day in it). The date must be valid.
number of months to move forward
Increments a date by some number of years. If the date is February 29, and the destination year is not a leap year, the date will be changed to February 28. The date must be valid.
number of years to move forward
If date is prior to min_date, sets date equal to min_date.
If date falls after max_date, sets date equal to max_date.
Otherwise, date is unchanged.
Either of min_date and max_date may be %NULL.
All non-%NULL dates must be valid.
minimum accepted value for date
maximum accepted value for date
Initializes one or more #GDate structs to a safe but invalid state. The cleared dates will not represent an existing date, but will not contain garbage. Useful to init a date declared on the stack. Validity can be tested with g_date_valid().
number of dates to clear
Frees a #GDate returned from g_date_new().
Returns the day of the month. The date must be valid.
Returns the day of the year, where Jan 1 is the first day of the year. The date must be valid.
Returns the week of the year, where weeks are interpreted according to ISO 8601.
Returns the Julian day or "serial number" of the #GDate. The Julian day is simply the number of days since January 1, Year 1; i.e., January 1, Year 1 is Julian day 1; January 2, Year 1 is Julian day 2, etc. The date must be valid.
Returns the week of the year, where weeks are understood to start on Monday. If the date is before the first Monday of the year, return 0. The date must be valid.
Returns the month of the year. The date must be valid.
Returns the week of the year during which this date falls, if weeks are understood to begin on Sunday. The date must be valid. Can return 0 if the day is before the first Sunday of the year.
Returns the day of the week for a #GDate. The date must be valid.
Returns the year of a #GDate. The date must be valid.
Returns %TRUE if the date is on the first of a month. The date must be valid.
Returns %TRUE if the date is the last day of the month. The date must be valid.
Sets the day of the month for a #GDate. If the resulting day-month-year triplet is invalid, the date will be invalid.
day to set
Sets the value of a #GDate from a day, month, and year. The day-month-year triplet must be valid; if you aren't sure it is, call g_date_valid_dmy() to check before you set it.
day
month
year
Sets the value of a #GDate from a Julian day number.
Julian day number (days since January 1, Year 1)
Sets the month of the year for a #GDate. If the resulting day-month-year triplet is invalid, the date will be invalid.
month to set
Parses a user-inputted string str, and try to figure out what date it
represents, taking the [current locale][setlocale] into account. If the
string is successfully parsed, the date will be valid after the call.
Otherwise, it will be invalid. You should check using g_date_valid()
to see whether the parsing succeeded.
This function is not appropriate for file formats and the like; it isn't very precise, and its exact behavior varies with the locale. It's intended to be a heuristic routine that guesses what the user means by a given string (and it does work pretty well in that capacity).
string to parse
Sets the value of a date from a #GTime value. The time to date conversion is done using the user's current timezone.
#GTime value to set.
Sets the value of a date to the date corresponding to a time specified as a time_t. The time to date conversion is done using the user's current timezone.
To set the value of a date to the current day, you could write:
time_t now = time (NULL);
if (now == (time_t) -1)
// handle the error
g_date_set_time_t (date, now);
time_t value to set
Sets the value of a date from a #GTimeVal value. Note that the
tv_usec member is ignored, because #GDate can't make use of the
additional precision.
The time to date conversion is done using the user's current timezone.
#GTimeVal value to set
Sets the year for a #GDate. If the resulting day-month-year triplet is invalid, the date will be invalid.
year to set
Moves a date some number of days into the past. To move by weeks, just move by weeks*7 days. The date must be valid.
number of days to move
Moves a date some number of months into the past. If the current day of the month doesn't exist in the destination month, the day of the month may change. The date must be valid.
number of months to move
Moves a date some number of years into the past. If the current day doesn't exist in the destination year (i.e. it's February 29 and you move to a non-leap-year) then the day is changed to February 29. The date must be valid.
number of years to move
Fills in the date-related bits of a struct tm using the date value.
Initializes the non-date parts with something safe but meaningless.
struct tm to fill
Returns %TRUE if the #GDate represents an existing day. The date must not contain garbage; it should have been initialized with g_date_clear() if it wasn't allocated by one of the g_date_new() variants.
Returns the number of days in a month, taking leap years into account.
month
year
Returns the number of weeks in the year, where weeks are taken to start on Monday. Will be 52 or 53. The date must be valid. (Years always have 52 7-day periods, plus 1 or 2 extra days depending on whether it's a leap year. This function is basically telling you how many Mondays are in the year, i.e. there are 53 Mondays if one of the extra days happens to be a Monday.)
a year
Returns the number of weeks in the year, where weeks are taken to start on Sunday. Will be 52 or 53. The date must be valid. (Years always have 52 7-day periods, plus 1 or 2 extra days depending on whether it's a leap year. This function is basically telling you how many Sundays are in the year, i.e. there are 53 Sundays if one of the extra days happens to be a Sunday.)
year to count weeks in
Returns %TRUE if the year is a leap year.
For the purposes of this function, leap year is every year divisible by 4 unless that year is divisible by 100. If it is divisible by 100 it would be a leap year only if that year is also divisible by 400.
year to check
Create a new #GDate representing the given day-month-year triplet.
The triplet you pass in must represent a valid date. Use g_date_valid_dmy() if needed to validate it. The returned #GDate is guaranteed to be non-%NULL and valid.
day of the month
month of the year
year
Generates a printed representation of the date, in a [locale][setlocale]-specific way. Works just like the platform's C library strftime() function, but only accepts date-related formats; time-related formats give undefined results. Date must be valid. Unlike strftime() (which uses the locale encoding), works on a UTF-8 format string and stores a UTF-8 result.
This function does not provide any conversion specifiers in addition to those implemented by the platform's C library. For example, don't expect that using g_date_strftime() would make the %F provided by the C99 strftime() work on Windows where the C library only complies to C89.
destination buffer
buffer size
format string
valid #GDate
Returns %TRUE if the day of the month is valid (a day is valid if it's between 1 and 31 inclusive).
day to check
Returns %TRUE if the day-month-year triplet forms a valid, existing day in the range of days #GDate understands (Year 1 or later, no more than a few thousand years in the future).
day
month
year
Returns %TRUE if the Julian day is valid. Anything greater than zero is basically a valid Julian, though there is a 32-bit limit.
Julian day to check
Returns %TRUE if the month value is valid. The 12 #GDateMonth enumeration values are the only valid months.
month
Returns %TRUE if the weekday is valid. The seven #GDateWeekday enumeration values are the only valid weekdays.
weekday
Returns %TRUE if the year is valid. Any year greater than 0 is valid, though there is a 16-bit limit to what #GDate will understand.
year
Represents a day between January 1, Year 1 and a few thousand years in the future. None of its members should be accessed directly.
If the
GDateis obtained from g_date_new(), it will be safe to mutate but invalid and thus not safe for calendrical computations.If it's declared on the stack, it will contain garbage so must be initialized with g_date_clear(). g_date_clear() makes the date invalid but safe. An invalid date doesn't represent a day, it's "empty." A date becomes valid after you set it to a Julian day or you set a day, month, and year.