[PATCH]: getdate.y: Allow usage of relative signed time offset even before time zone is specified.

[Ondřej Vašík]

Hello,
as reported in
https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/51106 ,
date sometimes produces different than expected output. I know it's
impossible to cover all possible date/time formats by grammar, but the
format "HH:MM + X minutes" looks quite common for me. I improved the
grammar of getdate.y to handle this situation - with side effect that
obscure date format "HH:MM +T day ago" won't work now (+T means timezone
here, +X means relative offset number). 
Note: "HH:MM +T yesterday" or "HH:MM +T +X days" works without troubles
even in new grammar.

Greetings,
         Ondřej Vašík

getdate_5_timerelsignedoffset.patch
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