From 67067f9ae35fcaf7c1a6f3258043cbd0a0380473 Mon Sep 17 00:00:00 2001 From: Bruce Momjian Date: Sun, 9 Nov 2014 20:50:15 -0500 Subject: [PATCH] C comment: mention 1500-02-29 as an invalid date It is invalid because the Gregorian calendar is used for all years. --- src/include/utils/datetime.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/include/utils/datetime.h b/src/include/utils/datetime.h index 548758a149..31c78540f2 100644 --- a/src/include/utils/datetime.h +++ b/src/include/utils/datetime.h @@ -274,7 +274,9 @@ 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. + * SQL standard specifies use of the Gregorian calendar. This prevents the + * date 1500-02-29 from being stored, even though it is valid in the Julian + * calendar. */ #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) -- 2.40.0