Dave,
I'm not sure how all phones are calculating their DST, but typically you
have their ntp client pointed to a ntpd server on your network and they
receive the servers UTC & local time and the local time is what the
phone should display. You should be able to also control this via your
dhcp server using the ntp-servers option, so by having a lease time of
say 8 hours, your phone should be updated at least once during the
night, and worst case would not get updated until 10 am ( since DST
changes at 2am ).
On your ntpd server ( and you should do this on all of your servers ) is
update the tz database. This is a collection of files, on for each
locale ( a defined location, which has, had or will have a differing
local time calculation from UTC ) which contain algorithms which will
calculate the correct UTC offset at anytime. Have you ever wondered why,
when your installing a new linux system and it asks you to pick a
locale, you'll see America/NewYork and America/Toronto and
America/Montreal? This is because back in time they actually had
different differing time offsets, and if you were doing any date/time
calculations this will be properly taken into consideration.
The tz homepage is here: http://www.twinsun.com/tz/tz-link.htm and you
can get the updated file from here ftp://elsie.nci.nih.gov/pub/ . This
ftp site is run by the US government. Not sure why it is on the the
Department of Healths site, when it is the Navy that is responsible for
US government timekeeping (http://tycho.usno.navy.mil).
Hope that helps.
Mike
Dave Donovan wrote:
This Daylight Saving Time change coming up in a month isn't anything
on the scale of Y2K but it makes me think the many places where little
calculations are made with timestamps. Our Blackberries are going to
be a pain.
I'm just curious to see what people are thinking about this. It seems
like there hasn't been much buzz and many people I've asked haven't
given it much thought. I think it's almost like there will be 3
timezones. EST, EDT and Energy Saving EDT.
Has anyone run into issues with Asterisk?
Obviously, any custom scripts that depend on remote servers are a
concern but, other than VM timestamps, and maybe some least cost
routing, are there obvious applications/features that you can think
need careful consideration?
Do you trust your upstream NTP server? Imagine if you patched your
system and they didn't patch theirs.
How often do your phones poll for NTP sync? Is it often enough that
it'll get synced up before your users come in or do you have to check
to make sure your firmware is going to handle the change itself.
Tell us what you think.
Dave
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