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utils: Add some ISO 8601 forms to get_date()

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Support the forms listed by the W3C [1].  I also removed the
'%Y-%d-%m' form, which can be confused with the '%Y-%m-%d' ISO form.
The new ISO forms can use 'Z' to designate UTC or '[+-]HHMM' to
specify offsets from UTC.  Other time zone designators are not
supported.

The '%z' directive has only been supported since Python 3.2 [2], so if
you're running Pelican on Python 2.7, you're stuck with 'Z' for UTC.
Conveniently, we get ValueErrors for both invalid directives and
data/format missmatches, so we don't need special handling for the 2.7
case inside get_date().

[1]: http://www.w3.org/TR/NOTE-datetime
[2]: http://bugs.python.org/issue6641
This commit is contained in:
W. Trevor King 2013-06-11 21:40:13 -04:00
commit 228fc82fc9
3 changed files with 74 additions and 34 deletions
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50
pelican/utils.py
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@ -15,7 +15,7 @@ from collections import Hashable
from functools import partial
from codecs import open, BOM_UTF8
from datetime import datetime
from datetime import datetime, timezone
from itertools import groupby
from jinja2 import Markup
from operator import attrgetter
@ -180,17 +180,39 @@ def get_date(string):
If no format matches the given date, raise a ValueError.
"""
string = re.sub(' +', ' ', string)
formats = ['%Y-%m-%d %H:%M', '%Y/%m/%d %H:%M',
'%Y-%m-%d', '%Y/%m/%d',
'%d-%m-%Y', '%Y-%d-%m', # Weird ones
'%d/%m/%Y', '%d.%m.%Y',
'%d.%m.%Y %H:%M', '%Y-%m-%d %H:%M:%S']
formats = [
# ISO 8601
'%Y',
'%Y-%m',
'%Y-%m-%d',
'%Y-%m-%dT%H:%M%z',
'%Y-%m-%dT%H:%MZ',
'%Y-%m-%dT%H:%M',
'%Y-%m-%dT%H:%M:%S%z',
'%Y-%m-%dT%H:%M:%SZ',
'%Y-%m-%dT%H:%M:%S',
'%Y-%m-%dT%H:%M:%S.%f%z',
'%Y-%m-%dT%H:%M:%S.%fZ',
'%Y-%m-%dT%H:%M:%S.%f',
# end ISO 8601 forms
'%Y-%m-%d %H:%M',
'%Y-%m-%d %H:%M:%S',
'%Y/%m/%d %H:%M',
'%Y/%m/%d',
'%d-%m-%Y',
'%d.%m.%Y %H:%M',
'%d.%m.%Y',
'%d/%m/%Y',
]
for date_format in formats:
try:
return datetime.strptime(string, date_format)
date = datetime.strptime(string, date_format)
except ValueError:
pass
raise ValueError("'%s' is not a valid date" % string)
continue
if date_format.endswith('Z'):
date = date.replace(tzinfo=timezone.utc)
return date
raise ValueError('{0!r} is not a valid date'.format(string))
class pelican_open(object):
@ -510,15 +532,11 @@ def file_watcher(path):
def set_date_tzinfo(d, tz_name=None):
""" Date without tzinfo shoudbe utc.
This function set the right tz to date that aren't utc and don't have
tzinfo.
"""
if tz_name is not None:
"""Set the timezone for dates that don't have tzinfo"""
if tz_name and not d.tzinfo:
tz = pytz.timezone(tz_name)
return tz.localize(d)
else:
return d
return d
def mkdir_p(path):