LEAPS_THRU_END_OF  581 arch/m68k/mac/misc.c #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
LEAPS_THRU_END_OF   25 drivers/rtc/lib.c #define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400)