Is there an easy way to convert an RFC 3339 time into a regular Python timestamp?
I’ve got a script which is reading an ATOM feed and I’d like to be able to compare the timestamp of an item in the ATOM feed to the modification time of a file.
I notice from the ATOM spec, that ATOM dates include a time zone offset (
Z<a number>) but, in my case, there’s nothing after the
Z so I guess we can assume GMT.
I suppose I could parse the time with a regex of some sort but I was hoping Python had a built-in way of doing it that I just haven’t been able to find.
No builtin, afaik.
This is a Python library module with functions for converting timestamp strings in RFC 3339 format to Python time float values, and vice versa. RFC 3339 is the timestamp format used by the Atom feed syndication format.
It is BSD-licensed.
(Edited so it’s clear I didn’t write it. 🙂
You don’t include an example, but if you don’t have a Z-offset or timezone, and assuming you don’t want durations but just the basic time, then maybe this will suit you:
import datetime as dt dt.datetime.strptime('1985-04-12T23:20:50.52', '%Y-%m-%dT%H:%M:%S.%f') datetime.datetime(1985, 4, 12, 23, 20, 50, 520000)
The strptime() function was added to the datetime module in Python 2.5 so some people don’t yet know it’s there.
Edit: The time.strptime() function has existed for a while though, and works about the same to give you a struct_time value:
'1985-04-12T23:20:50.52', '%Y-%m-%dT%H:%M:%S.%f') ts time.struct_time(tm_year=1985, tm_mon=4, tm_mday=12, tm_hour=23, tm_min=20, tm_sec=50, tm_wday=4, tm_yday=102, tm_isdst=-1) time.mktime(ts) 482210450.0ts = time.strptime(
I struggled with RFC3339 datetime format a lot, but I found a suitable solution to convert date_string <=> datetime_object in both directions.
You need two different external modules, because one of them is is only able to do the conversion in one direction (unfortunately):
sudo pip install rfc3339 sudo pip install iso8601
import datetime # for general datetime object handling import rfc3339 # for date object -> date string import iso8601 # for date string -> date object
For not needing to remember which module is for which direction, I wrote two simple helper functions:
def get_date_object(date_string): return iso8601.parse_date(date_string) def get_date_string(date_object): return rfc3339.rfc3339(date_object)
which inside your code you can easily use like this:
input_string = '1989-01-01T00:18:07-05:00' test_date = get_date_object(input_string) # >>> datetime.datetime(1989, 1, 1, 0, 18, 7, tzinfo=<FixedOffset '-05:00' datetime.timedelta(-1, 68400)>) test_string = get_date_string(test_date) # >>> '1989-01-01T00:18:07-05:00' test_string is input_string # >>> True
Heureka! Now you can easily (haha) use your date strings and date strings in a useable format.
http://pypi.python.org/pypi/iso8601/ seems to be able to parse iso 8601, which RFC 3339 is a subset of, maybe this could be useful, but again, not built-in.
http://bugs.python.org/issue15873 (duplicate of http://bugs.python.org/issue5207 )
Looks like there isn’t a built-in as of yet.
If you’re using Django, you could use Django’s function
from django.utils.dateparse import parse_datetime parse_datetime("2016-07-19T07:30:36+05:00") datetime.datetime(2016, 7, 19, 7, 30, 36, tzinfo=<django.utils.timezone.FixedOffset object at 0x101c0c1d0>)
feedparser.py provides robust/extensible way to parse various date formats that may be encountered in real-world atom/rss feeds:
from feedparser import _parse_date as parse_date parse_date('1985-04-12T23:20:50.52Z') time.struct_time(tm_year=1985, tm_mon=4, tm_mday=12, tm_hour=23, tm_min=20, tm_sec=50, tm_wday=4, tm_yday=102, tm_isdst=1)
try this, it works fine for me
datetime_obj = datetime.strptime("2014-01-01T00:00:00Z", '%Y-%m-%dT%H:%M:%SZ')
datetime_obj = datetime.strptime("Mon, 01 Jun 2015 16:41:40 GMT", '%a, %d %b %Y %H:%M:%S GMT')