Add support for 1904 dates

This commit adds support for dates using the 1904 calendar (starting 1904-01-01 00:00:00).
It also fixes some issues with the dates in 1900 calendar (which now correctly start at 1899-12-30 00:00:00).
Finally, it is now possible to have negative timestamps, representing dates before the base date (and up to 0000-01-01 00:00:00), as per the SpreadsheetML specs. Note that some versions of Excel don't support negative dates...
This commit is contained in:
Adrien Loison committed 2017-11-04 16:33:46 +01:00
1 parent e1ae3c8a81
commit c74c0d9127
9 files changed
+194 -102

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