[time-nuts] New stuff in my Tindie store

Mark Sims holrum at hotmail.com
Tue Dec 27 00:22:26 EST 2016

Ahhh, the subtle wonders of time zones and DST changes...  Heather lets you set your time zone offset down to the second, and does not range limit the offset.  If you want UTC +987:65:43 it's yours!   There are a surprising number of places on with weirdo time zones.   

I tried to find a manageable, self contained way to automatically calculate the time zone from lat/lon, but that's a losing battle.  Even getting it off the net is rather problematic.  I've thought about implementing a last-ditch emergency back-up plan of basing it on (longitude/15) but decided that was too un-time-nutty.   

Heather has standard DST rules for USA, Europe, Australia, and New Zealand (assuming it hasn't yet gone the way of Atlantis).  But since DST rules can change with the stroke a a politician's pen, you can specify a custom rule.  The one current DST limitation is the time must change at an hour...  that would be easy enough to change.


> The Pacific Ocean is large and very spread out.  So the Chatham Islands, 
though part of New Zealand are 45 minutes ahead of New Zealand time.  
That is a real nasty and unusual time change. Plus NZ daylight time 
being GMT +13

More information about the time-nuts mailing list