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C comment: mention why the Gregorian calendar is used pre-1582

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Bruce Momjian 2014-11-06 02:33:05 -05:00
parent 525a489915
commit 171c377a0a
1 changed files with 5 additions and 0 deletions
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src/include/utils/datetime.h
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@ -271,6 +271,11 @@ extern const char *const months[]; /* months (3-char abbreviations) */
extern const char *const days[]; /* days (full names) */
extern const int day_tab[2][13];
/*
* These are the rules for the Gregorian calendar, which was adopted in 1582.
* However, we use this calculation for all prior years as well because the
* SQL standard specifies use of the Gregorian calendar.
*/
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))