I fired up an MS Excel 2013 and yes, there 1900-02-29 exists and counts for
the serial date value!
My original comment was, that also storing in Sqlite the MS serial date
values would be possible (as well as Matlab date numbers, etc.), and the
Sqlite date/time functions allow quite easily to do the necessary
conversions. But such bugs outside Sqlite of course do complicate things...
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