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UncleGED doesn't seem to be able to handle BC dates. No timeline is generated. The BC dates do show in the pages.
Here is an example:
RIN: MH:IF225 1896 BC
RIN: MH:SC206 09 March 2014
RIN: MH:SC211 10 March 2014
RIN: MH:SC3199 11 April 2014
RIN: MH:IF226 1716 BC
In the settings the cutoff year appears to be zero, as in 0 AD.