Central time zone to GMT

Fixit7 · 03-13-2016, 09:34 AM

I live in the Central time zone.

How do I figure out which GMT to use ?

My clock did not go ahead by one hour. :-(

michaelk · 03-13-2016, 09:59 AM

The US Central Daylight Time (CDT) is UTC-5 hours. The fixed timezone is GMT-5.

Fixit7 · 03-13-2016, 12:50 PM

Thanks.

From what I read, setting the clock to CST will not change the time during Daylight Savings.

That's why I wanted to set it to GMT.

You may be able to outrun the cop car, but not the Motorola radio. :-)

michaelk · 03-13-2016, 12:58 PM

Are asking about setting time zones or just setting the current time?

Do you want the clock to read local time or UTC (GMT)?
Do you want the timezone to be displayed as local or UTC?

Fixit7 · 03-13-2016, 01:16 PM

I just want DST to update automatically.

I missed first service this morning.

michaelk · 03-13-2016, 01:25 PM

I'm hoping that puppy has zdump. Post the output of the command:

zdump -v /etc/localtime |grep 2016

Fixit7 · 03-13-2016, 01:48 PM

There was no output.

It just returned.

michaelk · 03-13-2016, 03:06 PM

What about

zdump -v /etc/localtime | head -10

I don't how puppy differs with time zones settings compared to a regular distribution.

Fixit7 · 03-13-2016, 03:32 PM

Quote:

/etc/localtime Fri Dec 13 20:45:52 1901 UTC = Sat Dec 14 01:45:52 1901 GMT-5 isdst=0 gmtoff=18000
/etc/localtime Sat Dec 14 20:45:52 1901 UTC = Sun Dec 15 01:45:52 1901 GMT-5 isdst=0 gmtoff=18000
/etc/localtime Mon Jan 18 03:14:07 2038 UTC = Mon Jan 18 08:14:07 2038 GMT-5 isdst=0 gmtoff=18000
/etc/localtime Tue Jan 19 03:14:07 2038 UTC = Tue Jan 19 08:14:07 2038 GMT-5 isdst=0 gmtoff=18000

Looks like I should have stuck with CST instead of GMT.

Puppy says

Quote:

Finding the correct entry is best, as it automatically applies DST, whereas the GMT entries are fixed offsets from the GMT(UTC) reference.

I had it set to CST, but my clock did not go ahead by one hour. ??

michaelk · 03-13-2016, 03:40 PM

Change back to CST and post the same information.

Fixit7 · 03-13-2016, 03:51 PM

CST setting

Quote:

/etc/localtime Fri Dec 13 20:45:52 1901 UTC = Fri Dec 13 14:45:52 1901 CST isdst=0 gmtoff=-21600
/etc/localtime Sat Dec 14 20:45:52 1901 UTC = Sat Dec 14 14:45:52 1901 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 31 07:59:59 1918 UTC = Sun Mar 31 01:59:59 1918 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 31 08:00:00 1918 UTC = Sun Mar 31 03:00:00 1918 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Oct 27 06:59:59 1918 UTC = Sun Oct 27 01:59:59 1918 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Oct 27 07:00:00 1918 UTC = Sun Oct 27 01:00:00 1918 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 30 07:59:59 1919 UTC = Sun Mar 30 01:59:59 1919 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 30 08:00:00 1919 UTC = Sun Mar 30 03:00:00 1919 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Oct 26 06:59:59 1919 UTC = Sun Oct 26 01:59:59 1919 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Oct 26 07:00:00 1919 UTC = Sun Oct 26 01:00:00 1919 CST isdst=0 gmtoff=-21600

michaelk · 03-13-2016, 04:08 PM

Oops...
zdump -v /etc/localtime | tail -10

zdump -v /etc/localtime | grep 2015
zdump -v /etc/localtime | grep 2017

Fixit7 · 03-13-2016, 04:48 PM

zdumps

Quote:

# zdump -v /etc/localtime | tail -10
/etc/localtime Sun Mar 9 07:59:59 2036 UTC = Sun Mar 9 01:59:59 2036 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 9 08:00:00 2036 UTC = Sun Mar 9 03:00:00 2036 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 2 06:59:59 2036 UTC = Sun Nov 2 01:59:59 2036 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 2 07:00:00 2036 UTC = Sun Nov 2 01:00:00 2036 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 8 07:59:59 2037 UTC = Sun Mar 8 01:59:59 2037 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 8 08:00:00 2037 UTC = Sun Mar 8 03:00:00 2037 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 1 06:59:59 2037 UTC = Sun Nov 1 01:59:59 2037 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 1 07:00:00 2037 UTC = Sun Nov 1 01:00:00 2037 CST isdst=0 gmtoff=-21600
/etc/localtime Mon Jan 18 03:14:07 2038 UTC = Sun Jan 17 21:14:07 2038 CST isdst=0 gmtoff=-21600
/etc/localtime Tue Jan 19 03:14:07 2038 UTC = Mon Jan 18 21:14:07 2038 CST isdst=0 gmtoff=-21600

# zdump -v /etc/localtime | grep 2015
/etc/localtime Sun Mar 8 07:59:59 2015 UTC = Sun Mar 8 01:59:59 2015 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 8 08:00:00 2015 UTC = Sun Mar 8 03:00:00 2015 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 1 06:59:59 2015 UTC = Sun Nov 1 01:59:59 2015 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 1 07:00:00 2015 UTC = Sun Nov 1 01:00:00 2015 CST isdst=0 gmtoff=-21600

# zdump -v /etc/localtime | grep 2017
/etc/localtime Sun Mar 12 07:59:59 2017 UTC = Sun Mar 12 01:59:59 2017 CST isdst=0 gmtoff=-21600
/etc/localtime Sun Mar 12 08:00:00 2017 UTC = Sun Mar 12 03:00:00 2017 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 5 06:59:59 2017 UTC = Sun Nov 5 01:59:59 2017 CDT isdst=1 gmtoff=-18000
/etc/localtime Sun Nov 5 07:00:00 2017 UTC = Sun Nov 5 01:00:00 2017 CST isdst=0 gmtoff=-21600

michaelk · 03-13-2016, 05:02 PM

Looks reasonable. Interesting that 2016 is blank?

Code:

zdump -v /usr/share/zoneinfo/posix/America/Chicago | grep 2016
/usr/share/.../America/Chicago  Sun Mar 13 07:59:59 2016 UTC = Sun Mar 13 01:59:59 2016 CST isdst=0 gmtoff=-21600
/usr/share/.../America/Chicago  Sun Mar 13 08:00:00 2016 UTC = Sun Mar 13 03:00:00 2016 CDT isdst=1 gmtoff=-18000
/usr/share/.../America/Chicago  Sun Nov  6 06:59:59 2016 UTC = Sun Nov  6 01:59:59 2016 CDT isdst=1 gmtoff=-18000
/usr/share/.../America/Chicago  Sun Nov  6 07:00:00 2016 UTC = Sun Nov  6 01:00:00 2016 CST isdst=0 gmtoff=-21600

I replaced zoneinfo/posix with /../ for readability.