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Postgres FD Implementation
Commit 171c377a authored by Bruce Momjian's avatar Bruce Momjian
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C comment: mention why the Gregorian calendar is used pre-1582

parent 525a4899
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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) */ ...@@ -271,6 +271,11 @@ extern const char *const months[]; /* months (3-char abbreviations) */
extern const char *const days[]; /* days (full names) */ extern const char *const days[]; /* days (full names) */
extern const int day_tab[2][13]; 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)) #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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