date_proc.cc File Reference

#include "config_ff.h"
#include <cassert>
#include "Error.h"

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Functions
int	dayofweek (double j)
	Given a Julian day number, return the day of week for that date. More...
int	days_in_month (int year, int month)
double	days_in_year (int year)
	How many days are in the given Gregorian year? More...
void	days_to_month_day (int year, int ddd, int *month, int *day)
	Given the day number of the year, return the month and day of the month. More...
void	gregorian_date (double jd, int *year, int *month, int *day, int *hours, int *minutes, double *seconds)
	Given a Julian day number, return the Gregorian date. More...
int	is_leap (int year)
	Is the given Gregorian year a leap year? More...
long	julian_day (int year, int month, int day)
	Given a gregorian date in year, month and day, return the Julian day number. More...
int	month_day_to_days (int year, int month, int day)
	Given the month and day numbers, return the days since the first of the year. More...

Function Documentation

int dayofweek

(

double

j

)

Given a Julian day number, return the day of week for that date.

Returns

Day of week (0-6)

Definition at line 257 of file date_proc.cc.

int days_in_month	(	int	year,
		int	month
	)

Definition at line 191 of file date_proc.cc.

References is_leap().

Referenced by operator==(), and operator>=().

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double days_in_year

(

int

year

)

How many days are in the given Gregorian year?

Returns

The number of days, as a double.

Definition at line 59 of file date_proc.cc.

References is_leap().

Referenced by DODS_Date::fraction(), and DODS_Date_Time::get().

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void days_to_month_day	(	int	year,
		int	ddd,
		int *	month,
		int *	day
	)

Given the day number of the year, return the month and day of the month.

Parameters

year	The year.
ddd	The day of the year (ones-based).
month	The correcponding month of the year (ones-based value-result parameter).
day	The day of the month (ones-based value-result parameter).

Returns

void.

Definition at line 238 of file date_proc.cc.

References assert, and is_leap().

Referenced by DODS_Date::set().

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void gregorian_date	(	double	jd,
		int *	year,
		int *	month,
		int *	day,
		int *	hours,
		int *	minutes,
		double *	seconds
	)

Given a Julian day number, return the Gregorian date.

The Julian day number is passed as a double while the gregorian date is returned using six `value-result' parameters:

See also

Algorithm 199 in Collected algorithms of the CACM Author: Robert G. Tantzen, Translator: Nat Howard

Parameters

jd	The Julian date to convert.
year	The year fully-qualified (1977 is `1977' not 77, `77' is 77 A.D.)
month	The month. Ones-based.
day	The day.
hours	The hour. zero-based.
minutes	The minutes. zero-based.
seconds	The seconds. zero-based.

Returns

void

Definition at line 121 of file date_proc.cc.

References assert, and L.

int is_leap

(

int

year

)

Is the given Gregorian year a leap year?

Returns

1 if the year is a leap year, otherwise return 0.

Definition at line 52 of file date_proc.cc.

Referenced by days_in_month(), days_in_year(), and days_to_month_day().

long julian_day	(	int	year,
		int	month,
		int	day
	)

Given a gregorian date in year, month and day, return the Julian day number.

NB: I am not sure this code deals correctly with dates before 1100 A.D.

Parameters

year	The year. Must be A.D. and `fully qualified'
month	The month. Ones-based month number (Jan = 1, Dec = 12).
day	The day. Ones-based day number.

See also

ACM Collected algorithms.

Returns

The Julian day number.

Definition at line 86 of file date_proc.cc.

References L.

Referenced by operator<=(), operator==(), and operator>=().

int month_day_to_days	(	int	year,
		int	month,
		int	day
	)

Given the month and day numbers, return the days since the first of the year.

Parameters

year	The year.
month	The month of the year.
day	The days of the month.

Returns

The days since the first of the year (ones-based).

Definition at line 169 of file date_proc.cc.

Referenced by DODS_Date::set().