$differ_year=substr-substr;$how_int_4_floor=floor1;//向下取整$how_int_4_ceil=ceil1;//向上取整if$how_leap_year=$how_int_4_floor-1;else$how_leap_year=$how_int_4_floor;$how_noleap_year=$differ_year-$how_leap_year;$differ_year2day=$how_noleap_year*365$how_leap_year*3