[tz] please do not enforce limits in code for time zones

[Michael H Deckers]

On 2018-01-22 18:55, Steve Allen wrote:

> The traditional calendar for observing at Lick Observatory has always
> had days begin at local noon.  This means that the time zone for the
> Lick calendar is 20 hours behind Greenwich.  I implore all
> implementors to accommodate local time zones which are not limited to
> the list that is part of tzdb.

   One could just use TZ='LickT20'. The extremal offsets for
   standard POSIX TZ strings are +-24:59:59 h.

   Michael Deckers.