Retrieve first hour in daylight savings change - GNU date
Clash Royale CLAN TAG#URR8PPP
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Last weekend most of Western Europe shifted back one hour - there were two instances of 2017-10-29T02:00.
To translate the time into UTC I can use GNU date:
$ date -d 'TZ="Europe/Rome" 2017-10-29 02:00'
Sun Oct 29 01:00:00 UTC 2017
This returns the time in CET (ie the second 2am). How do I get date to return Sun Oct 29 00:00:00 UTC 2017 (the first 2am - CEST)?
Info:
$ date --version
date (GNU coreutils) 8.21
date coreutils
asked Oct 30 '17 at 1:24
DarkHeart
3,38822136
add a comment |Â
up vote
1
down vote
favorite
Last weekend most of Western Europe shifted back one hour - there were two instances of 2017-10-29T02:00.
To translate the time into UTC I can use GNU date:
$ date -d 'TZ="Europe/Rome" 2017-10-29 02:00'
Sun Oct 29 01:00:00 UTC 2017
This returns the time in CET (ie the second 2am). How do I get date to return Sun Oct 29 00:00:00 UTC 2017 (the first 2am - CEST)?
Info:
$ date --version
date (GNU coreutils) 8.21
date coreutils
asked Oct 30 '17 at 1:24
DarkHeart
3,38822136
Actually, CEST ended on October 29, at 3:00 AM. So, 2 AM CET was 3 AM CEST.
– kiamlaluno
Oct 30 '17 at 6:06
@kiamlaluno - I thought that’s what I said. At 3am the clocks went back an hour to 2am - ie two 2 AMs
– DarkHeart
Oct 30 '17 at 6:21
Did you trydate -u?
– Serge
Oct 30 '17 at 7:03
You are saying you get Sun Oct 29 01:00:00 UTC 2017 as output ofdate -d 'TZ="Europe/Rome" 2017-10-29 02:00'and you would want to get Sun Oct 29 00:00:00 UTC 2017, which is two hours earlier than the input. That is not just changing from CEST to CET or vice versa. On October 29, 2017, 2:00 AM CEST is 2:00 AM CEST, and 2:00 AM CET is 3:00 AM CEST.
– kiamlaluno
Oct 30 '17 at 9:13
@kiamlaluno - Yes I want to change UTC to Europe time - havingdatetranslate both hours (2am CEST and 2am CET) not just the one.
– DarkHeart
Oct 31 '17 at 0:20
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
Last weekend most of Western Europe shifted back one hour - there were two instances of 2017-10-29T02:00.
To translate the time into UTC I can use GNU date:
$ date -d 'TZ="Europe/Rome" 2017-10-29 02:00'
Sun Oct 29 01:00:00 UTC 2017
This returns the time in CET (ie the second 2am). How do I get date to return Sun Oct 29 00:00:00 UTC 2017 (the first 2am - CEST)?
Info:
$ date --version
date (GNU coreutils) 8.21
date coreutils
asked Oct 30 '17 at 1:24
DarkHeart
3,38822136
Last weekend most of Western Europe shifted back one hour - there were two instances of 2017-10-29T02:00.
To translate the time into UTC I can use GNU date:
$ date -d 'TZ="Europe/Rome" 2017-10-29 02:00'
Sun Oct 29 01:00:00 UTC 2017
This returns the time in CET (ie the second 2am). How do I get date to return Sun Oct 29 00:00:00 UTC 2017 (the first 2am - CEST)?
Info:
$ date --version
date (GNU coreutils) 8.21
date coreutils
asked Oct 30 '17 at 1:24
DarkHeart
3,38822136
asked Oct 30 '17 at 1:24
DarkHeart
3,38822136
asked Oct 30 '17 at 1:24
DarkHeart
3,38822136
asked Oct 30 '17 at 1:24
DarkHeart
3,38822136
3,38822136
Actually, CEST ended on October 29, at 3:00 AM. So, 2 AM CET was 3 AM CEST.
– kiamlaluno
Oct 30 '17 at 6:06
@kiamlaluno - I thought that’s what I said. At 3am the clocks went back an hour to 2am - ie two 2 AMs
– DarkHeart
Oct 30 '17 at 6:21
Did you trydate -u?
– Serge
Oct 30 '17 at 7:03
You are saying you get Sun Oct 29 01:00:00 UTC 2017 as output ofdate -d 'TZ="Europe/Rome" 2017-10-29 02:00'and you would want to get Sun Oct 29 00:00:00 UTC 2017, which is two hours earlier than the input. That is not just changing from CEST to CET or vice versa. On October 29, 2017, 2:00 AM CEST is 2:00 AM CEST, and 2:00 AM CET is 3:00 AM CEST.
– kiamlaluno
Oct 30 '17 at 9:13
@kiamlaluno - Yes I want to change UTC to Europe time - havingdatetranslate both hours (2am CEST and 2am CET) not just the one.
– DarkHeart
Oct 31 '17 at 0:20
add a comment |Â
Actually, CEST ended on October 29, at 3:00 AM. So, 2 AM CET was 3 AM CEST.
– kiamlaluno
Oct 30 '17 at 6:06
@kiamlaluno - I thought that’s what I said. At 3am the clocks went back an hour to 2am - ie two 2 AMs
– DarkHeart
Oct 30 '17 at 6:21
Did you trydate -u?
– Serge
Oct 30 '17 at 7:03
You are saying you get Sun Oct 29 01:00:00 UTC 2017 as output ofdate -d 'TZ="Europe/Rome" 2017-10-29 02:00'and you would want to get Sun Oct 29 00:00:00 UTC 2017, which is two hours earlier than the input. That is not just changing from CEST to CET or vice versa. On October 29, 2017, 2:00 AM CEST is 2:00 AM CEST, and 2:00 AM CET is 3:00 AM CEST.
– kiamlaluno
Oct 30 '17 at 9:13
@kiamlaluno - Yes I want to change UTC to Europe time - havingdatetranslate both hours (2am CEST and 2am CET) not just the one.
– DarkHeart
Oct 31 '17 at 0:20
Actually, CEST ended on October 29, at 3:00 AM. So, 2 AM CET was 3 AM CEST.
– kiamlaluno
Oct 30 '17 at 6:06
Actually, CEST ended on October 29, at 3:00 AM. So, 2 AM CET was 3 AM CEST.
– kiamlaluno
Oct 30 '17 at 6:06
@kiamlaluno - I thought that’s what I said. At 3am the clocks went back an hour to 2am - ie two 2 AMs
– DarkHeart
Oct 30 '17 at 6:21
@kiamlaluno - I thought that’s what I said. At 3am the clocks went back an hour to 2am - ie two 2 AMs
– DarkHeart
Oct 30 '17 at 6:21
Did you try
date -u ?– Serge
Oct 30 '17 at 7:03
Did you try
date -u ?– Serge
Oct 30 '17 at 7:03
You are saying you get Sun Oct 29 01:00:00 UTC 2017 as output of
date -d 'TZ="Europe/Rome" 2017-10-29 02:00' and you would want to get Sun Oct 29 00:00:00 UTC 2017, which is two hours earlier than the input. That is not just changing from CEST to CET or vice versa. On October 29, 2017, 2:00 AM CEST is 2:00 AM CEST, and 2:00 AM CET is 3:00 AM CEST.– kiamlaluno
Oct 30 '17 at 9:13
You are saying you get Sun Oct 29 01:00:00 UTC 2017 as output of
date -d 'TZ="Europe/Rome" 2017-10-29 02:00' and you would want to get Sun Oct 29 00:00:00 UTC 2017, which is two hours earlier than the input. That is not just changing from CEST to CET or vice versa. On October 29, 2017, 2:00 AM CEST is 2:00 AM CEST, and 2:00 AM CET is 3:00 AM CEST.– kiamlaluno
Oct 30 '17 at 9:13
@kiamlaluno - Yes I want to change UTC to Europe time - having
date translate both hours (2am CEST and 2am CET) not just the one.– DarkHeart
Oct 31 '17 at 0:20
@kiamlaluno - Yes I want to change UTC to Europe time - having
date translate both hours (2am CEST and 2am CET) not just the one.– DarkHeart
Oct 31 '17 at 0:20
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
1
down vote
The reference for timezone changes is zdump:
$ /usr/sbin/zdump -v -c 2017,2018 Europe/Rome
Europe/Rome -9223372036854775808 = NULL
Europe/Rome -9223372036854689408 = NULL
Europe/Rome Sun Mar 26 00:59:59 2017 UTC = Sun Mar 26 01:59:59 2017 CET isdst=0
Europe/Rome Sun Mar 26 01:00:00 2017 UTC = Sun Mar 26 03:00:00 2017 CEST isdst=1
Europe/Rome Sun Oct 29 00:59:59 2017 UTC = Sun Oct 29 02:59:59 2017 CEST isdst=1
Europe/Rome Sun Oct 29 01:00:00 2017 UTC = Sun Oct 29 02:00:00 2017 CET isdst=0
Europe/Rome 9223372036854689407 = NULL
Europe/Rome 9223372036854775807 = NULL
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
add a comment |Â
up vote
1
down vote
accepted
The time TZ="Europe/Rome" 2017-10-29 02:00 is ambiguous since this translates to two different UTC times, 00:00 and 01:00.
How to make date return both is to specify the exact timezone itself, eg
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CEST'
Sun Oct 29 00:00:00 UTC 2017
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CET'
Sun Oct 29 01:00:00 UTC 2017
However this means you have to work out the timezone outside the date command.
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
The reference for timezone changes is zdump:
$ /usr/sbin/zdump -v -c 2017,2018 Europe/Rome
Europe/Rome -9223372036854775808 = NULL
Europe/Rome -9223372036854689408 = NULL
Europe/Rome Sun Mar 26 00:59:59 2017 UTC = Sun Mar 26 01:59:59 2017 CET isdst=0
Europe/Rome Sun Mar 26 01:00:00 2017 UTC = Sun Mar 26 03:00:00 2017 CEST isdst=1
Europe/Rome Sun Oct 29 00:59:59 2017 UTC = Sun Oct 29 02:59:59 2017 CEST isdst=1
Europe/Rome Sun Oct 29 01:00:00 2017 UTC = Sun Oct 29 02:00:00 2017 CET isdst=0
Europe/Rome 9223372036854689407 = NULL
Europe/Rome 9223372036854775807 = NULL
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
add a comment |Â
up vote
1
down vote
The reference for timezone changes is zdump:
$ /usr/sbin/zdump -v -c 2017,2018 Europe/Rome
Europe/Rome -9223372036854775808 = NULL
Europe/Rome -9223372036854689408 = NULL
Europe/Rome Sun Mar 26 00:59:59 2017 UTC = Sun Mar 26 01:59:59 2017 CET isdst=0
Europe/Rome Sun Mar 26 01:00:00 2017 UTC = Sun Mar 26 03:00:00 2017 CEST isdst=1
Europe/Rome Sun Oct 29 00:59:59 2017 UTC = Sun Oct 29 02:59:59 2017 CEST isdst=1
Europe/Rome Sun Oct 29 01:00:00 2017 UTC = Sun Oct 29 02:00:00 2017 CET isdst=0
Europe/Rome 9223372036854689407 = NULL
Europe/Rome 9223372036854775807 = NULL
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
add a comment |Â
up vote
1
down vote
up vote
1
down vote
The reference for timezone changes is zdump:
$ /usr/sbin/zdump -v -c 2017,2018 Europe/Rome
Europe/Rome -9223372036854775808 = NULL
Europe/Rome -9223372036854689408 = NULL
Europe/Rome Sun Mar 26 00:59:59 2017 UTC = Sun Mar 26 01:59:59 2017 CET isdst=0
Europe/Rome Sun Mar 26 01:00:00 2017 UTC = Sun Mar 26 03:00:00 2017 CEST isdst=1
Europe/Rome Sun Oct 29 00:59:59 2017 UTC = Sun Oct 29 02:59:59 2017 CEST isdst=1
Europe/Rome Sun Oct 29 01:00:00 2017 UTC = Sun Oct 29 02:00:00 2017 CET isdst=0
Europe/Rome 9223372036854689407 = NULL
Europe/Rome 9223372036854775807 = NULL
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
The reference for timezone changes is zdump:
$ /usr/sbin/zdump -v -c 2017,2018 Europe/Rome
Europe/Rome -9223372036854775808 = NULL
Europe/Rome -9223372036854689408 = NULL
Europe/Rome Sun Mar 26 00:59:59 2017 UTC = Sun Mar 26 01:59:59 2017 CET isdst=0
Europe/Rome Sun Mar 26 01:00:00 2017 UTC = Sun Mar 26 03:00:00 2017 CEST isdst=1
Europe/Rome Sun Oct 29 00:59:59 2017 UTC = Sun Oct 29 02:59:59 2017 CEST isdst=1
Europe/Rome Sun Oct 29 01:00:00 2017 UTC = Sun Oct 29 02:00:00 2017 CET isdst=0
Europe/Rome 9223372036854689407 = NULL
Europe/Rome 9223372036854775807 = NULL
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
answered Oct 30 '17 at 7:20
SatÃ…Â Katsura
10.7k11533
10.7k11533
add a comment |Â
add a comment |Â
up vote
1
down vote
accepted
The time TZ="Europe/Rome" 2017-10-29 02:00 is ambiguous since this translates to two different UTC times, 00:00 and 01:00.
How to make date return both is to specify the exact timezone itself, eg
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CEST'
Sun Oct 29 00:00:00 UTC 2017
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CET'
Sun Oct 29 01:00:00 UTC 2017
However this means you have to work out the timezone outside the date command.
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
add a comment |Â
up vote
1
down vote
accepted
The time TZ="Europe/Rome" 2017-10-29 02:00 is ambiguous since this translates to two different UTC times, 00:00 and 01:00.
How to make date return both is to specify the exact timezone itself, eg
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CEST'
Sun Oct 29 00:00:00 UTC 2017
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CET'
Sun Oct 29 01:00:00 UTC 2017
However this means you have to work out the timezone outside the date command.
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
add a comment |Â
up vote
1
down vote
accepted
up vote
1
down vote
accepted
The time TZ="Europe/Rome" 2017-10-29 02:00 is ambiguous since this translates to two different UTC times, 00:00 and 01:00.
How to make date return both is to specify the exact timezone itself, eg
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CEST'
Sun Oct 29 00:00:00 UTC 2017
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CET'
Sun Oct 29 01:00:00 UTC 2017
However this means you have to work out the timezone outside the date command.
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
The time TZ="Europe/Rome" 2017-10-29 02:00 is ambiguous since this translates to two different UTC times, 00:00 and 01:00.
How to make date return both is to specify the exact timezone itself, eg
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CEST'
Sun Oct 29 00:00:00 UTC 2017
$ date -ud 'TZ="Europe/Rome" 02:00:00 10/29/2017 CET'
Sun Oct 29 01:00:00 UTC 2017
However this means you have to work out the timezone outside the date command.
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
answered Oct 31 '17 at 0:57
DarkHeart
3,38822136
3,38822136
add a comment |Â
add a comment |Â
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Actually, CEST ended on October 29, at 3:00 AM. So, 2 AM CET was 3 AM CEST.
– kiamlaluno
Oct 30 '17 at 6:06
@kiamlaluno - I thought that’s what I said. At 3am the clocks went back an hour to 2am - ie two 2 AMs
– DarkHeart
Oct 30 '17 at 6:21
Did you try
date -u?– Serge
Oct 30 '17 at 7:03
You are saying you get Sun Oct 29 01:00:00 UTC 2017 as output of
date -d 'TZ="Europe/Rome" 2017-10-29 02:00'and you would want to get Sun Oct 29 00:00:00 UTC 2017, which is two hours earlier than the input. That is not just changing from CEST to CET or vice versa. On October 29, 2017, 2:00 AM CEST is 2:00 AM CEST, and 2:00 AM CET is 3:00 AM CEST.– kiamlaluno
Oct 30 '17 at 9:13
@kiamlaluno - Yes I want to change UTC to Europe time - having
datetranslate both hours (2am CEST and 2am CET) not just the one.– DarkHeart
Oct 31 '17 at 0:20