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TextFebruary 31, with regard to the modern Western (revised Gregorian) calendar, is an imaginary date. It is sometimes used for example purposes, to make it clear regardless of context that the information being presented is artificial and not real data. February 30 is sometimes used in the same manner, although there are other calendars that legitimately use February 30. In this respect, these "dates" are similar to other clearly fictional data used for a similar purpose, such as the 12th of Never or "John Q. Public".
TextGravestone in the graveyard of the deconsecrated church of St Peter-in-the-East, Oxford, which reads: HOUNSLOW, John d. 31.3.1871 HOUNSLOW, Sarah, his wife, d. 31.2.1835; six children, died in infancy; Ann, wife of John Hounslow, d. 6.11.1890