Time Zone

[Lloyd]

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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