February 28

February 28 is the 59th day of the year in the Gregorian calendar. There are 306 days remaining until the end of the year (307 in leap years).

The Gregorian calendar attempts to keep the vernal equinox on or soon before March 21; hence it follows the vernal equinox year. The average length of this calendar's year is 365.2425 mean solar days (as 97 out of 400 years are leap years); this is within one ppm of the current length of the mean tropical year (365.24219 days). The vernal equinox is estimated to fall back in the Gregorian calendar by one day by the year 4000 not because of this difference but because of the slowing down of the Earth's rotation and the associated lengthening of the sidereal day.