Question about DST changes in the US

[Les Mikesell]

Mike McCarty wrote:

>>
>> Ntp and fedora always run in UTC which doesn't change for local DST 
> 
> Are you sure about this, Les? I've got a Fedora install, and I recall
> specifically telling it to use hardware time, not UTC, and when I
> boot Windows XP it tells me the same time as Fedora.
> 
>> variations.  The tzdata info is used for conversions to display 
>> localtime using the local conventions for the user's timezone.
> 

Yes, it can keep the motherboard hardware clock in localtime but 
internally everything is UTC and converted to the user's timezone for 
display - and different users can be in different timezones at the same 
time.  Try:

date
then
TZ=PST8PDT date   (or any timezone other than the one you set as the 
default).

Basically the time() system call works in seconds since 00:00:00 UTC, 
January 1, 1970, and localtime() and variations take that value and 
convert to the local form.

-- 
   Les Mikesell
    lesmikesell at gmail.com