March is in present time held to be the third month of the year in both the Julian and Gregorian calendars. It is one of the seven months which are 31 days long.

March in the Northern Hemisphere is the seasonal equivalent of September in the Southern Hemisphere.

In the Northern hemisphere, the beginning of the meteorological spring is 1 March. In the Southern hemisphere, the beginning of the meteorological autumn is 1st March.

March starts on the same day of the week as November every year and February in common years only. March ends on the same day of the week as June every year. In leap years, March starts on the same day as September and December of the previous year. In common years, March starts on the same day as June of the previous year.

The name of March comes from ancient Rome, when March was the first month of the year and named Martius after Mars or Ares, the Greek god of war. In Rome, where the climate is Mediterranean, March was the first month of spring, a logical point for the beginning of the year as well as the start of the military campaign season. January became the first month of the calendar year either under King Numa Pompilius (c. 713 BC) or under the Decemvirs about 450 BC (Roman writers differ). The numbered year began on March 1 in Russia until the end of the 15th century. Great Britain and its colonies continued to use March 25 until 1752, which was when they ultimately adopted the Gregorian calendar. Many other cultures and religions still celebrate the beginning of the New Year in March.