Overview

A "leap year starting on Saturday" is a calendar year with 366 days in which January 1 falls on a Saturday. In the widely used Gregorian calendar, this arrangement produces a distinctive pattern of weekdays for every date in the year. Such years occur on a repeating cycle determined by the leap-year rules of the Gregorian system and the seven-day week. Examples of leap years that begin on a Saturday include 1944, 1972, 2000, and forthcoming instances such as 2028 and later years. The Gregorian calendar itself is discussed further at this general overview.

Calendar characteristics

When January 1 is Saturday in a leap year, the extra day in February shifts the latter part of the year compared with common years. In this configuration:

  • February 29 falls on a Tuesday.
  • Most month-start weekdays follow a predictable sequence: for example, March 1 is also a Tuesday, and October begins on a Sunday in many such years.
  • The distribution of weekday dates implies particular occurrences for dated events (see the holiday list below) and affects which months contain Friday the 13th.

Holidays and observances (typical in the United States)

Because federal and customary holidays are pegged to either a fixed date or to a weekday within a month, their calendar dates shift in a way that can be directly read from the year's weekday layout. In a leap year that starts on Saturday, a typical pattern is:

  • Martin Luther King Jr. Day: January 17
  • Valentine's Day: Monday
  • Presidents' Day: falls on its latest possible date, February 21
  • Leap Day (February 29): Tuesday
  • St. Patrick's Day: Friday
  • Mother's Day: the latest possible date, May 14
  • Memorial Day: May 29 (last Monday in May)
  • Father's Day: June 18
  • Independence Day: Tuesday
  • Labor Day: September 4
  • Columbus Day: October 9
  • Halloween: Tuesday
  • Veterans Day: Saturday
  • Thanksgiving: November 23 (fourth Thursday)
  • Christmas: Monday

One notable property of a leap year beginning on Saturday is that it is one of only three leap-year starting days that produce exactly one Friday the 13th in the year; the other two are leap years that start on Tuesday and leap years that start on Friday. In a leap year that begins on Saturday, the lone Friday the 13th falls in October. Common years that begin on Sunday share the October Friday the 13th, and in addition may have an extra occurrence in January.

History, cycles and notable facts

The Gregorian calendar repeats its pattern of days over a 400-year cycle, and certain structural results follow from that cycle. In particular, end-of-century leap years (those divisible by 400) have a consistent starting weekday under the Gregorian rules: these century leap years begin on a Saturday, as illustrated by the year 2000 and projected for the year 2400. For broader context about leap-year starting weekdays and comparisons with other starting-day types, see entries on leap years beginning on Tuesday, on Friday, and common years beginning on Sunday. For a general description of what defines a leap year, follow this reference: leap year, and for weekday names see Saturday.

Because weekday placements determine many social and administrative schedules (school calendars, fiscal planning, religious observances), knowing the pattern of a leap year that starts on Saturday helps planners anticipate how holidays and deadlines will fall across that year.