day light saving time happened today
fbsd8 at a1poweruser.com
Mon Mar 11 12:49:48 UTC 2013
Ben Cottrell wrote:
> On Mar 10, 2013, at 19:18, Fbsd8 <fbsd8 at a1poweruser.com> wrote:
>> What is really needed is for the tzsetup program to state which east coast selections have day light saving included. Maybe a pr is in order.
> Nope, you pretty conclusively proved that you're using the right
> time zone setting. Trust me. :-) That md5 you posted is the exact
> same md5 that's on my own system. My own America/New_York is
> doing just fine, thank you. ;-)
> Something else is going on. *What*, I don't know. But you chose
> the right time zone in tzsetup and that time zone description
> file definitely does have DST rules in it.
> I never use the wall_cmos_clock setting, because I don't trust
> it -- at least with the traditional behavior (wall_cmos_clock=0)
> I know *exactly* what's going on. I really don't know what is
> happening under the hood when that's turned on, so I have no
> idea if it could be related or not. But I'm curious what
> it shows if you run:
> sysctl machdep.wall_cmos_clock
sysctl machdep.wall_cmos_clock returned 0
Ran this little test.
Last night before turning off my system I used the date command to set
the date to 3/9 with the correct DST. This morning when I turned on my
system the time had advanced by one hour. So this proves that the time
zone setting does have DST in it and every thing worked as expected.
Even though the system is now on DST the date command still displays
EDT. Does the date command ever show DST?
Now about the question of why did the time not jump forward on the date
it was suppose to?
It all boils down to this, On 3/9 I did not check the time. I just
expected it to be correct. Even though the date and time is displayed
every morning when I boot my system, I have never in 20 years taken the
time to verify if its correct on any of the many PCs I have used.
It is totally possible that the system time was incorrect and I was just
not aware of it before DST went into effect, after which I checked the
time as I did with all the other clocks in the house.
So for now, thats how I am leaving things.
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