For determining the current date, my date functions roundtrip just fine:
✈saturn:~$ date
Sun Jan 8 12:32:24 IST 2012
✈saturn:~$ date +%s
1326018753
✈saturn:~$ date -d @1326018753
Sun Jan 8 12:32:33 IST 2012
However, for dates in the past they do not:
✈saturn:~$ date +%s -d 2006-12-31t22:00
1167577200
✈saturn:~$ date -d @1167577200
Sun Dec 31 17:00:00 IST 2006
✈saturn:~$
Notice that 22:00 became 17:00 - that is a five hour difference!
As can be seen, I am on IST, which is UTC+2, so it does not account
for the discrepancy:
http://en.wikipedia.org/wiki/Israel_Standard_Time
This is on Kubuntu 11.10. Thanks.
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01-08-2012, 11:06 AM
Nils Kassube
Why the discrepancy in date?
Dotan Cohen wrote:
> For determining the current date, my date functions roundtrip just
> fine: ✈saturn:~$ date
> Sun Jan 8 12:32:24 IST 2012
> ✈saturn:~$ date +%s
> 1326018753
> ✈saturn:~$ date -d @1326018753
> Sun Jan 8 12:32:33 IST 2012
>
>
> However, for dates in the past they do not:
> ✈saturn:~$ date +%s -d 2006-12-31t22:00
> 1167577200
Interesting - why do you use "t" instead of " " as a separator between
date and time?
> ✈saturn:~$ date -d @1167577200
> Sun Dec 31 17:00:00 IST 2006
> ✈saturn:~$
>
> Notice that 22:00 became 17:00 - that is a five hour difference!
>
> As can be seen, I am on IST, which is UTC+2, so it does not account
> for the discrepancy:
Well, IST probably isn't the reason because here the same happens with
my time zone being CET (UTC+1):
~/ > date +%s -d 2006-12-31t22:00
1167577200
~/ > LC_ALL=C date -d @1167577200
Sun Dec 31 16:00:00 CET 2006
(I used the "LC_ALL=C" to get an English output string.)
However if I use " " instead of "t" as separator between date and time,
I get what I would expect:
~/ > date +%s -d "2006-12-31 22:00"
1167598800
~/ > LC_ALL=C date -d @1167598800
Sun Dec 31 22:00:00 CET 2006
So to me it looks like your "t" separator makes the date command use the
time zone UTC+7 intead of your local time zone. Furthermore, if I
specify a time zone together with your "t" separator, date complains
about an invalid date:
~/ > LC_ALL=C date +%s -d "2006-12-31t22:00 UTC"
date: invalid date `2006-12-31t22:00 UTC'
Nils
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01-08-2012, 01:50 PM
Dotan Cohen
Why the discrepancy in date?
On Sun, Jan 8, 2012 at 14:06, Nils Kassube <kassube@gmx.net> wrote:
>> However, for dates in the past they do not:
>> ✈saturn:~$ date +%s -d 2006-12-31t22:00
>> 1167577200
>
> Interesting - why do you use "t" instead of " " as a separator between
> date and time?
>
Because then I do not need the quotes. It is also ISO standard 8601:
http://en.wikipedia.org/wiki/ISO_8601
✈saturn:~$ date +%s -d "2006-12-31 22:00"
1167595200
✈saturn:~$ date +%s -d 2006-12-31t22:00
1167577200
That is interesting, I've never noticed that behaviour before.
>> ✈saturn:~$ date -d @1167577200
>> Sun Dec 31 17:00:00 IST 2006
>> ✈saturn:~$
>>
>> Notice that 22:00 became 17:00 - that is a five hour difference!
>>
>> As can be seen, I am on IST, which is UTC+2, so it does not account
>> for the discrepancy:
>
> Well, IST probably isn't the reason because here the same happens with
> my time zone being CET (UTC+1):
>
> ~/ > date +%s -d 2006-12-31t22:00
> 1167577200
> ~/ > LC_ALL=C date -d @1167577200
> Sun Dec 31 16:00:00 CET 2006
>
> (I used the "LC_ALL=C" to get an English output string.)
> However if I use " " instead of "t" as separator between date and time,
> I get what I would expect:
>
> ~/ > date +%s -d "2006-12-31 22:00"
> 1167598800
> ~/ > LC_ALL=C date -d @1167598800
> Sun Dec 31 22:00:00 CET 2006
>
> So to me it looks like your "t" separator makes the date command use the
> time zone UTC+7 intead of your local time zone. Furthermore, if I
> specify a time zone together with your "t" separator, date complains
> about an invalid date:
>
> ~/ > LC_ALL=C date +%s -d "2006-12-31t22:00 UTC"
> date: invalid date `2006-12-31t22:00 UTC'
>
Even specifying UTC (that is the Z timezone) doesn't help:
✈saturn:~$ date +%s -d "2006-12-31 22:00Z"
1167602400
✈saturn:~$ date -d @1167602400
Mon Jan 1 00:00:00 IST 2007
✈saturn:~$ date +%s -d "2006-12-31 22:00"
1167595200
✈saturn:~$ date -d @1167595200
Sun Dec 31 22:00:00 IST 2006
✈saturn:~$
I do not believe that there should be a difference when using the T separator.
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01-08-2012, 03:09 PM
Nils Kassube
Why the discrepancy in date?
Dotan Cohen wrote:
> On Sun, Jan 8, 2012 at 14:06, Nils Kassube <kassube@gmx.net> wrote:
> >> However, for dates in the past they do not:
> >> ✈saturn:~$ date +%s -d 2006-12-31t22:00
> >> 1167577200
> >
> > Interesting - why do you use "t" instead of " " as a separator
> > between date and time?
>
> Because then I do not need the quotes. It is also ISO standard 8601:
> http://en.wikipedia.org/wiki/ISO_8601
Ah, that's the reason - I didn't know about that standard.
> > So to me it looks like your "t" separator makes the date command
> > use the time zone UTC+7 intead of your local time zone.
> > Furthermore, if I specify a time zone together with your "t"
> > separator, date complains about an invalid date:
> >
> > ~/ > LC_ALL=C date +%s -d "2006-12-31t22:00 UTC"
> > date: invalid date `2006-12-31t22:00 UTC'
>
> Even specifying UTC (that is the Z timezone) doesn't help:
> ✈saturn:~$ date +%s -d "2006-12-31 22:00Z"
> 1167602400
> ✈saturn:~$ date -d @1167602400
> Mon Jan 1 00:00:00 IST 2007
But that looks correct to me - if IST = UTC+2, then "2006-12-31 22:00Z"
is the same as "Mon Jan 1 00:00:00 IST 2007", isn't it?
> I do not believe that there should be a difference when using the T
> separator.
Agreed, it seems there is a bug in the date command. When it reads that
"t" separator it shouldn't take it as a time zone.
Nils
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01-08-2012, 04:10 PM
Marius Gedminas
Why the discrepancy in date?
On Sun, Jan 08, 2012 at 05:09:48PM +0100, Nils Kassube wrote:
> Dotan Cohen wrote:
> > On Sun, Jan 8, 2012 at 14:06, Nils Kassube <kassube@gmx.net> wrote:
> > >> However, for dates in the past they do not:
> > >> ✈saturn:~$ date +%s -d 2006-12-31t22:00
> > >> 1167577200
> > >
> > > Interesting - why do you use "t" instead of " " as a separator
> > > between date and time?
> >
> > Because then I do not need the quotes. It is also ISO standard 8601:
> > http://en.wikipedia.org/wiki/ISO_8601
>
> Ah, that's the reason - I didn't know about that standard.
>
> > > So to me it looks like your "t" separator makes the date command
> > > use the time zone UTC+7 intead of your local time zone.
> > > Furthermore, if I specify a time zone together with your "t"
> > > separator, date complains about an invalid date:
...
> > I do not believe that there should be a difference when using the T
> > separator.
>
> Agreed, it seems there is a bug in the date command. When it reads that
> "t" separator it shouldn't take it as a time zone.
Note that it accepts almost any single-letter military timezone
specification[1] between the date and the time.
$ LC_ALL=C TZ=UTC date -d 20120101a12:00
Sun Jan 1 13:00:00 UTC 2012
$ LC_ALL=C TZ=UTC date -d 20120101b12:00
Sun Jan 1 14:00:00 UTC 2012
$ LC_ALL=C TZ=UTC date -d 20120101c12:00
Sun Jan 1 15:00:00 UTC 2012
...
$ LC_ALL=C TZ=UTC date -d 20120101s12:00
Sun Jan 1 06:00:00 UTC 2012
$ LC_ALL=C TZ=UTC date -d 20120101t12:00
Sun Jan 1 05:00:00 UTC 2012
$ LC_ALL=C TZ=UTC date -d 20120101u12:00
Sun Jan 1 04:00:00 UTC 2012
$ LC_ALL=C TZ=UTC date -d 20120101z12:00
Sun Jan 1 12:00:00 UTC 2012
I suspect the code was written before ISO-8601 even existed.
Marius Gedminas
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01-09-2012, 07:47 AM
Dotan Cohen
Why the discrepancy in date?
It turns out that this issue is fixed in date 8.13. The current Ubuntu
is still on date 8.5 without the fix.
Thanks!
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01-09-2012, 11:08 AM
"W. Scott Lockwood III"
Why the discrepancy in date?
> -----Original Message-----
> It turns out that this issue is fixed in date 8.13. The current Ubuntu is
still on
> date 8.5 without the fix.
>
> Thanks!
>
> --
> Dotan Cohen
>
> http://gibberish.co.il
> http://what-is-what.com
[W. Scott Lockwood III]
Is there a version available in a backports repo?
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01-09-2012, 12:05 PM
Dotan Cohen
Why the discrepancy in date?
On Mon, Jan 9, 2012 at 14:08, W. Scott Lockwood III
<vladinator@gmail.com> wrote:
> Is there a version available in a backports repo?
>
I haven't looked, but I doubt it. Try the 12.04 alphas, they should be
on the latest kernel and GNU tools.
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01-10-2012, 07:39 AM
Dotan Cohen
Why the discrepancy in date?
On Mon, Jan 9, 2012 at 14:08, W. Scott Lockwood III
<vladinator@gmail.com> wrote:
> Is there a version available in a backports repo?
>
Bob Proulx sent me a recent date binary for Squeeze. It works fine in
Kubuntu 11.10. Note that I didn't compile it, but I trust the guy who
did! The list rejected my attachment, so I am sending the binary to
Scott in a private mail. If anyone else needs it, then reply back.
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Why the discrepancy in date?
