Thirtieth of the month

The thirtieth of the month or thirtieth day of the month is the recurring calendar date position corresponding to the day numbered 30 of each month. In the Gregorian calendar (and other calendars that number days sequentially within a month), this day occurs in every month of the year except February, and therefore occurs eleven times per year. In four months of the year—April, June, September, and November—it is the last day of the month.

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