/**
* icaltime_compare_date:
* @date1:
* @date2:
*
* Compare date parts of {@link icaltimetype} objects. Return negative value, 0 or positive value
* accordingly if date1 is before, same day of after date2.
* As a bonus it returns the amount of days passed between two days on the same year.
*
* Returns: negative, 0 or positive
**/
gint
icaltime_compare_date (const icaltimetype *date1,
const icaltimetype *date2)
{
if (date2 == NULL)
return 0;
if (date1->year < date2->year)
return -1;
else if (date1->year > date2->year)
return 1;
else
return time_day_of_year (date1->day, date1->month - 1, date1->year) -
time_day_of_year (date2->day, date2->month - 1, date2->year);
}
/**
* time_day_of_week:
* @day: The day.
* @month: The month.
* @year: The 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.
*
* Return value: the day of the week for the given date.
*/
int
time_day_of_week (int day, int month, int year)
{
int n;
n = (year - 1) * 365 + time_leap_years_up_to (year - 1)
+ time_day_of_year (day, month, year);
if (n < REFORMATION_DAY)
return (n - 1 + SATURDAY) % 7;
if (n >= (REFORMATION_DAY + MISSING_DAYS))
return (n - 1 + SATURDAY - MISSING_DAYS) % 7;
return THURSDAY;
}