days.h File Reference

Function prototypes for making days from standard time and computing day differences. More...

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Functions
double	mkdays (int year, int mon, int mday)
	Days of year, month and day of month.
double	diff_days (int year1, int year0)
	Compute difference in days between two years.

Detailed Description

Function prototypes for making days from standard time and computing day differences.

Copyright

2025, Roy Ratcliffe, Northumberland, United Kingdom

Definition in file days.h.

Function Documentation

diff_days()

double diff_days	(	int	year1,
		int	year0 )

Compute difference in days between two years.

Parameters

year1	Year to compute for.
year0	Base year for comparison.

Returns

The difference between the "make time" days in-between the two years and the leap_day() difference.

Definition at line 16 of file days.c.

mkdays()

double mkdays	(	int	year,
		int	mon,
		int	mday )

Days of year, month and day of month.

Uses the standard library's "make time" function to make the number of days for a year, month and month day. Divides the seconds by 86,400 (the number of seconds in a day) in order to answer days rather than seconds.

Parameters

year	Year from 1970.
mon	One-based month. Converts to a zero-based month.
mday	Day of the month starting at one.

Note

The standard library's mktime() function has a prescribed minimum start time of 1970. Times cannot precede the first day of that year.

Definition at line 7 of file days.c.