Various functions to convert between calendar dates and Julian days. More...

Functions
int	cal_date (double tjd, short restrict year, short restrict month, short restrict day, double restrict hour)
	This function will compute a broken down date on the astronomical calendar given the Julian day input.
double	julian_date (short year, short month, short day, double hour)
	Returns the Julian day for a given astronomical calendar date.
int	novas_day_of_week (double tjd)
	Returns the one-based ISO 8601 day-of-week index of a given Julian Date.
int	novas_day_of_year (double tjd, enum novas_calendar_type calendar, int *restrict year)
	Returns the one-based day index in the calendar year for a given Julian Date.
int	novas_is_leap_year (int year, enum novas_calendar_type calendar)
	Checks if a given year is a leap year in a specific calendar.
double	novas_jd_from_date (enum novas_calendar_type calendar, int year, int month, int day, double hour)
	Returns the Julian day for a given calendar date.
int	novas_jd_to_date (double tjd, enum novas_calendar_type calendar, int restrict year, int restrict month, int restrict day, double restrict hour)
	This function will compute a broken down date on the specified calendar for given the Julian day input.

Detailed Description

Various functions to convert between calendar dates and Julian days.

Function Documentation

int novas_is_leap_year	(	int	year,
		enum novas_calendar_type	calendar )

Checks if a given year is a leap year in a specific calendar.

Parameters

year	[yr] The calendar year. for X BCE, it is 1 - X. For example 45 BCE is -44.
calendar	The type of calendar

Returns: TRUE (1) if the year is a leap year in the calendar, or FALSE (0) if it is not a leap year, or else -1 if the calendar is invalid (errno set to EINVAL).