[R] Extract year from date

ALBERTO VIEIRA FERREIRA MONTEIRO albmont at centroin.com.br
Wed Mar 11 12:47:12 CET 2015

I think these dates are from some historical database, as they are
labeled "BC". And the days might refer to some Epoch of ancient
calendars, maybe the Chinese Calendar whose Epoch was 105 BC (at least
if we can trust Wikipedia:
https://en.wikipedia.org/wiki/Chinese_calendar )

Alberto Monteiro

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