First time of the day

[email protected] (Eric Brine) Fri, 27 Dec 2013 13:29:06 -0500
Newsgroups perl.datetime
Message-ID <CALJW-qG1Ck3o3NpPiGSVeqbfc6CbRo0qsOb4zkP8vPc=8GN-aw@mail.gmail.com>
Hi!

Given a date and time zone, is it possible to obtain the first time of that
date?

For example. in America/Sao_Paulo, 2013/10/20 started at 01:00 rather than
the usual midnight.

I've also asked this on StackOverflow, where I posted a potentially
incorrect solution.
http://stackoverflow.com/q/20805667/589924

- Eric