[ntp:questions] question about DST

Richard B. Gilbert rgilbert88 at comcast.net
Fri May 30 20:42:06 UTC 2008


Asrai khn wrote:
> Hi list,
> 
> Our Goverment is implementing DST. DST starts on : on Sunday, June 1, 2008
> at 12:01 (this is the first time we are going for DST)
> 
> *So we have to forward our clock by one hour.*
> 
> 
> In this regards I have few questions how to make ready our ntp server which
> is serving all our machine
> 
> All machines using local time not UTC.
> 
> 1. Is it possible to adjust only the ntp server for DST thing and let all
> other machines automatically get the new time from ntp server?

No.  NTP does not concern itself with time zones or issues of daylight 
vs. standard time!  NTP deals ONLY in UTC!  Displaying local time is the 
responsibility of the Operating System.  You generally have to configure 
something in the O/S to tell it what time zone you wish to use for the 
display of time and what the current rules for changing from standard to 
DST and back are.

(from the man page for date)
"   -u    Display (or set)  the  date  in  Greenwich  Mean  Time
            (GMT-universal  time), bypassing the normal conversion
            to (or from) local time."

A single machine might display different times for users in different 
time zones!




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