March 0 is an imaginary date. This formulation may be used in software such as Microsoft Excel to refer to the last day of February as a way of allowing for the fact that its length varies in leap years. It can also be used as a term for half-birthdays of people born on August 29, 30 and 31.
"March 0" is sometimes used by astronomers as a synonym for the last day of February.
See also 
- Simon Ramo, Ronald Sugar, Strategic Business Forecasting: A Structured Approach to Shaping the Future
- Astronomical Almanac for the year 2003, Washington and London: U.S Government Printing Office and The Stationery Office, 2001, p. K2
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