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[1] [CITE@en[February 30 - Wikipedia]]
([TIME[2016-12-24 01:42:14 +09:00]])
<https://en.wikipedia.org/wiki/February_30>
]FIGCAPTION]

> March 0 is an imaginary date, used (most often in astronomy and software engineering) to refer to the last day of February, as a way of allowing for the fact that the number of days in February varies in leap years.'''['''6''']''''''['''7''']'''

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