ISO with timezone
Nicholas F. Fabry
nick.fabry at coredump.us
Wed Jan 30 05:50:18 CET 2008
On Jan 29, 2008, at 13:56, nik wrote:
> that does help and now I have:
>>>> from datetime import datetime, tzinfo, timedelta
>>>> import time
>>>> class TZ(tzinfo):
> ... def utcoffset(self,dt): return timedelta(seconds=time.timezone)
>>>> print datetime(2008,2,29,15,30,11,tzinfo=TZ()).isoformat()
> But what I want to know now it how to get the actual time into the
> expression instead of typing the 2008,2,29,15....
> So something like: >>> print
> datetime(time.gmtime(),tzinfo=TZ()).isoformat(), but that doesn't
> I realize that I could do:
>>>> t = time.gmtime()
> but I imagine there might be a cleaner way of doing this.
No need for the ugliness! The constructor for class datetime has a
method, .now() that returns the current date and time, as a naive
datetime object (i.e. no tzinfo attached). Since you want an aware
datetime object (one with a tzinfo object attached), you can do it
simply by feeding .now the tzinfo object you want attached, as below:
>>> print datetime.now(TZ()).isoformat('T')
See PSL, Sect. 5.1.4
Dates and Times are a bit ugly in Python. Don't be discouraged, but
you do need to understand them quite well to get bug-free code that
plays with them.
> On Jan 28, 9:10 pm, "Nicholas F. Fabry" <nick.fa... at coredump.us>
>> Hello, nik.
>> On Jan 28, 2008, at 21:03, nik wrote:
>>> How does one express the time in ISO format with the timezone
>>> what I want is YYYY-MM-DDThh:mm:ss.sTZD
>>>> From the documentation I see:
>>>>>> from datetime import tzinfo, timedelta, datetime
>>>>>> class TZ(tzinfo):
>>> ... def utcoffset(self, dt): return timedelta(minutes=-399)
>>>>>> datetime(2002, 12, 25, tzinfo=TZ()).isoformat(' ')
>>> '2002-12-25 00:00:00-06:39'
>>> and I've also figured out:
>>> But can't figure out how to fit them together.
>> There is nothing there to 'fit together' - in the first example
>> the datetime object has no time component specified, so it fills in
>> default vaules of zero. The following should make this clear:
>>>>> your_time = datetime(2008, 2, 29, 15, 30, 11, tzinfo=TZ())
>>>>> print your_time
>> 2008-02-29 15:30:11-05:00
>>>>> print your_time.isoformat('T')
>> If you wish to append the NAME of the tzinfo object instead of its
>> offset, that requires a bit more playing around (along with a
>> defined tzinfo object - check out dateutil or pytz for a concrete
>> implementation of tzinfo subclasses (i.e. timezones)), but the
>> following would work:
>>>>> print your_time.strftime('%Y-%m-%dT%H:%M:%S %Z')
>> 2008-02-29T15:30:11 EST
>> For details on how the .strftime method works, see Python Standard
>> Library, Section 14.2.
>> I hope this helps!
>> Nick Fabry
>>> Thank you,
More information about the Python-list