EncodeDate

Returns the integer portion of a double-precision decimal DateTime value corresponding to the specified date.

The integer portion of the DateTime value indicates the number of days that have elapsed since January 1st, 1900, and the fractional portion of the DateTime value indicates the fraction of the day that has passed since midnight.

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Example

EncodeDate(08,01,01)  will return a value of 39448.00000000, corresponding to the specified date 
of January 1st, 2008