[ABE.pm] finding calendar units

[Ricardo SIGNES]

Ok, I want to do something, and I know how to do it, but I'm hoping
there exists a nice pre-built (non-DateTime!) solution.

Given a date in the format [year, [month, [ day ]]] I want to determine
(begin, end) seconds.  So:

 span(2004);       # (first sec of 2004,         last sec of 2004)
 span(2004,01);    # (first sec of jan 2004,     last sec of jan 2004)
 span(2004,01,02); # (first sec of jan 2nd 2004, last sec of jan 2nd 2004)

Suggestions?

-- 
rjbs
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