@MONTH[mm-dd-yy]: Returns the month number for the specified date (1-12). MONTH uses the date format and separators mandated by your country code (for example dd.mm.yy in Germany, or yy-mm-dd in Japan). The year can be entered as a 4-digit or 2-digit value. Two-digit years between 80 and 99 are interpreted as 1980 - 1999; values between 00 and 79 are interpreted as 2000 - 2079.