Syntax: DAY(DT)
DT = a date/time value
DAY returns the day of the month component of the date/time value DT.
Examples:
DAY(24203) = 6 (24203 represents April 6, 1966)
DAY(TODAY()) = 25, where TODAY() = January 25, 1994
DAY(366) = 31 (366 represents December 31, 1900)
Excel function: DAY