DATE
This function calculates a date specified by year, month, day 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 any other number format.
This function is part of the Open Document Format for Office Applications (OpenDocument) standard Version 1.2. (ISO/IEC 26300:2-2015)
Syntax
DATE(Year; Month; Day)
Year is an integer in the range 1583 to 9956 or in the range 0 to 99.
In Tools - Options - Office - General you can set from which year a two-digit number entry is recognised as 20xx.
Month is an integer in the range 1 to 12 indicating the month.
Day is an integer in the range 1 to 31 indicating the day of the month.
If the values for month and day are out of bounds, they are carried over to the next digit. If you enter =DATE(00;12;31) the result will be 2000-12-31. If, on the other hand, you enter =DATE(00;13;31) the result will be 2001-01-31.
Example
=DATE(00;01;31) yields 31/01/00 if the cell format setting is DD/MM/YY.