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Date manipulation functions.


// IsLeap returns true if year is a leap year.
func IsLeap(year int64) bool

// NextDay advance Time structure to the next day.
func NextDay(t *time.Time)

// PrevDay adjust Time structure one day behind.
func PrevDay(t *time.Time)

// NextMonth advance Time structure one month ahead.
func NextMonth(t *time.Time)

// PrevMonth adjust Time structure one month behind.
func PrevMonth(t *time.Time)

// Weekday returns day of week number.
//
// Use Sakamoto's method (valid for dates in Oct 15, 1582 - Dec 31, 9999)
// (see http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week )
//
// Args:
//	year (e.g., 1988)
//	month (1-12)
//	day of the month (1-31)
// Returns:
//	0 = Sunday, 1 = Monday, ...
//
func Weekday(year, month, day int) int