DAYS_PER_4_YEARS   90 ext/calendar/french.c #define DAYS_PER_4_YEARS   1461
DAYS_PER_4_YEARS  134 ext/calendar/gregor.c #define DAYS_PER_4_YEARS   1461
DAYS_PER_4_YEARS  153 ext/calendar/julian.c #define DAYS_PER_4_YEARS   1461