View source for OLE Automation Date

== Format details ==
It is in the form of an 8-byte floating point number.

Positive values correspond to the number of days (including fractions of a day) since "midnight 1899-12-30". Apparently this means the midnight at the ''beginning'' of 1899-12-30, i.e. 48 hours before the beginning of the year 1900.

Negative values are interpreted in a more complex way.

The valid range is usually considered to be the years 100 through 9999.

Times are usually treated as being in local time.