This function converts a date written as year, month, day to an internal serial number and displays it in the cell's formatting. The default format of a cell containing the DATE function is the date format, but you can format the cells with the 0 number format, which displays the internal serial number of the date as a number.
DATE(year; month; day)
Year is an integer between 1583 and 9956 or 0 and 99.
In you can set from which year a two-digit number entry is recognized as 20xx.
Month is an integer indicating the month. A value between 1 and 12.
Day is an integer indicating the day of the month. A value between 1 and 31.
If the values for month and day are out of bounds, they are carried over to the next digit. If you enter =DATE(2000;12;31) the result will be 2000-12-31. If, on the other hand, you enter =DATE(2000;13;31) the result will be 2001-01-31.
To avoid ambiguity, always use four digits for years.
=DATE(00;1;31) yields the date 2000-01-31 written as 01/31/00 if the cell format setting is MM/DD/YY.
