February 30 occurs in some calendars, but not in the Gregorian calendar, where February contains only 28 or in a leap year, 29 days,February 30 is usually used as a sarcastic date for referring to something that will never happen or will never be done.
In J.R.R. Tolkien's Middle-earth legendarium, the Hobbits have developed the Shire Reckoning. According to Appendix D to The Lord of the Rings written by Tolkien, this calendar has arranged the year neatly in 12 months of 30 days each. The month the Hobbits call "Solmath", is rendered in the text as "February", and therefore the date 30 February exists in the narrative.
The Symmetry454 calendar contains a February 30.
Although many sources erroneously state that 30-day months were used in the Soviet Union for part or all of the period 1929–1940, in fact the Soviet calendar with 5- and 6-day weeks was only used for assigning workdays and days of rest in factories. The traditional calendar remained for everyday use—surviving physical calendars from that period only show the irregular months of the Gregorian calendar, including a 28- or 29-day February, so there was never a February 30 in the Soviet Union.