When does February have 29 days?

A leap year in the Gregorian calendar includes an extra day at the end of February. A leap year consists of 366 days, whereas other years, called common years, have 365 days. The extra day, February 29 is the 60th day of a leap year in the Gregorian calendar. Leap years are needed to keep our calendar in alignment with the earth's revolutions around the sun. The next Leap year will be in 2012 (next year!!) Every 4 years a Leap year occurs. In my opinion this method is good, because it occurs to align the years with the Earth going around the sun. It may be a little hard to understand, but this method works! :)