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Date functions: Use the as_utc parameter to have them return UTC dates
I don't know for sure, but I highly doubt that Python handles BC dates very well. The default strftime function that comes with python doesn't even handle dates before 1900 (this is a limitation inherited from strftime in C libraries).
Why not use a interface action plugin. That will add an icon to the calibre toolbar. Your friends click on it, a dialog pops up they enter the data and the plugin does the rest.
Slightly more complex to create this kind of plugin, though.
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