Time Zone

[Peter Gordon]

Details are in the manual for "date" and works for Linux

Examples:
# TZ=NZ date '+%z'
+1300

#TZ=Israel date '+%z'
+0200

#TZ=Poland date '+%z'
+0100

#TZ=Asia/Omsk date '+%z'
+0600

Peter

On Wed, 2007-01-03 at 11:24 +0530, Lloyd wrote:
> Thank you Paul. I saw that /usr/share/zoneinfo/zone.tab contains a list
> of time zones (This is what I want) like 
> 
> #country-
> #code	coordinates	TZ			comments
> AD	+4230+00131	Europe/Andorra
> AE	+2518+05518	Asia/Dubai
> AF	+3431+06912	Asia/Kabul
> AG	+1703-06148	America/Antigua
> AI	+1812-06304	America/Anguilla
> ....
> ....
> 
> Now what I want is to convert this zone name to its corresponding offset
> from UTC.
> 
> for example the offset for Asia/Calcutta from UTC is +530. How can get
> this +530 from Asia/Calcutta ? Any functions available for this?
> 
> Regards,
>   Lloyd
> 
> 
> On Tue, 2007-01-02 at 10:04 -0500, Paul Koning wrote:
> > >>>>> "lloyd" == lloyd  <lloyd at cdactvm.in> writes:
> > 
> >  lloyd> Hi, I would like to read the time zone information from the
> >  lloyd> user. Does anybody know an easy way for this? (Like one
> >  lloyd> available in Windows and Linux ). I would like to read it from
> >  lloyd> the bitmap (time zone map) as well as from a combo box. From
> >  lloyd> where to I can get the time zone list? (I made a preliminary
> >  lloyd> search in Internet)
> > 
> > Timezone stuff is much harder than it seems.  There are lots of
> > shorcuts that get you in trouble.  
> > 
> > On Unix systems, the full list of timezones is in the file system tree
> > at /usr/share/zoneinfo.  And the timezone setting is a filename
> > relative to that subtree, for example US/Eastern or Asia/Calcutta.  I
> > don't know where the map comes from.
> > 
> > Windows seems to have a subset of the full set of zones.  The problem
> > with a subset is that you end up not being able to represent the time
> > rules for a given country or part of a country.  The offset from UTC
> > isn't the problem -- the problem is in the rules for when "daylight
> > savings time" ("summer time") starts and ends, or whether there is any
> > at all.  There are only about 30 different UTC offsets in the world,
> > but several hundred summer time rulesets.  That's why there are so
> > many entries under /usr/share/zoneinfo...
> > 
> > If I had to do this, I'd either ask the user for a zone name, then
> > validate it against the zoneinfo tree, or I'd offer up a listbox
> > populated from a walk of that tree.  Or perhaps a tree control?
> > 
> >      paul
> > 
> > 
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