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Re: Is %z broken for return values of time.gmtime()?

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  Re: Is %z broken for return values of time.gmtime()? Michael Schwarz <michi.schwarz@gmail.com> - 2013-09-16 22:55 +0200

#54244 — Re: Is %z broken for return values of time.gmtime()?

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On 2013-W38-1, at 19:56, random832@fastmail.us wrote:

> On Mon, Sep 16, 2013, at 9:15, Michael Schwarz wrote:
>> According to the documentation of time.gmtime(), it returns a struct_time
>> in UTC, but %z is replaced by +0100, which is the UTC offset of my OS’s
>> time zone without DST, but DST is currently in effect here (but was not
>> at the timestamp passed to gmtime()).
> 
> The struct_time type does not include information about what timezone it
> is in.

Uhm … Python 3.3 introduced the tm_gmtoff member of struct_time, which contains the offset to UTC. I thought, %z was also introduced in Python 3.3 and so I thought it would use that field. What time zone does it use then? Does it always use the system's time zone?

> You can use datetime.datetime (e.g. datetime.datetime.fromtimestamp(40 *
> 365 * 86400,datetime.timezone.utc) - the datetime.datetime class has a
> strftime method.

I do use that, but I was using time.localtime() to convert a POSIX timestamp to a date using the system's timezone and saw that while a struct_time produced by time.localtime() and formatted using time.strftime() shows the correct time zone (+0100 and +0200 here), it does not for a struct_time produced by time.gmtime(). I think that's strange.

> You should be aware that %F and %T are not portable and won't work on
> windows for example.

I’m aware of that, but thanks. I was toying around and just needed to print the rest of the date.

Regards
Michael

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