Convienience functions for formatting dates/times using zope.i18n and TAL
Project description
Python Format Functions
The van.timefmt module is a support module for date/time specific operations.
>>> from datetime import date, datetime >>> mydate = date(1975, 12, 17) >>> mydatetime = datetime(1975, 12, 17, 5, 24, 36)
It provides a “timefmt” function which can take either a date or datetime object:
>>> from van.timeformat import ltimefmt, timefmt
Fixed formatting
Fixed formats are locale independant. They are useful in 2 situations:
Computer parsable dates
Projects with no localization requirement
default formatting
If no format argument is specified, dates and datetimes are formatted using .isoformat(” “):
>>> print timefmt(mydatetime) 1975-12-17T05:24:36>>> print timefmt(mydate) 1975-12-17
The ‘iso’ format also triggers this:
>>> print timefmt(mydatetime, format='iso') 1975-12-17T05:24:36
If None is used as an input date, timefmt will return None:
>>> timefmt(None) is None True
rfc2822
The date in compliance with the RFC 2822 Internet email standard.
>>> print timefmt(mydate, 'rfc2822') Wed, 17 Dec 1975 00:00:00 +0000>>> print timefmt(mydatetime, 'rfc2822') Wed, 17 Dec 1975 05:24:36 +0000
Extending formats
If we want to extend the list of formats available, we can use the “time_format” zcml command defined in this module’s meta.zcml.
An example of use is in configure.zcml where the rfc2822 format is defined.
Note: it’s probably a good idea to use namespaces for registrations. The van.timeformat module promises to not use “.” in any of it’s default registrations.
Unicode
The return type is a unicode string:
>>> timefmt(mydatetime) u'1975-12-17T05:24:36'
And we can have unicode in the formats:
>>> timefmt(mydatetime, format='unicode_test') u'1975-17-12 Extended Arabic-Indic Digit Seven: \u06f7:'
Locale dependant translations
>>> from zope.i18n.locales import locales
>>> german = locales.getLocale('de', 'de')
>>> us = locales.getLocale('en', 'us')
>>> britain = locales.getLocale('en', 'gb')
Returns unicode:
>>> ltimefmt(mydate, us) u'Dec 17, 1975'
Defaults correctly chosen for date and datetime:
>>> print ltimefmt(mydate, us) Dec 17, 1975 >>> print ltimefmt(mydatetime, us) Dec 17, 1975 5:24:36 AM
But we can force format one as the other:
>>> print ltimefmt(mydate, us, category="dateTime") Dec 17, 1975 12:00:00 AM >>> print ltimefmt(mydatetime, us, category="date") Dec 17, 1975
Localized:
>>> print ltimefmt(mydate, britain, category="date", length="long") 17 December 1975 >>> print ltimefmt(mydate, german, category="date", length="long") 17. Dezember 1975
If None is used as an input date, ltimefmt will return None:
>>> ltimefmt(None, us) is None True
Localized formatting examples
Short dates:
>>> print ltimefmt(mydate, us, category="date", length="short") 12/17/75
Medium Dates:
>>> print ltimefmt(mydate, us, category="date", length="medium") Dec 17, 1975
Long Dates:
>>> print ltimefmt(mydate, us, category="date", length="long") December 17, 1975
Short Datetimes:
>>> print ltimefmt(mydatetime, us, category="dateTime", length="short") 12/17/75 5:24 AM
Medium Datetimes:
>>> print ltimefmt(mydatetime, us, category="dateTime", length="medium") Dec 17, 1975 5:24:36 AM
Long Datetimes:
>>> print ltimefmt(mydatetime, us, category="dateTime", length="long") December 17, 1975 5:24:36 AM +000
Integration with ZPT
If the zope.app.pagetemplate module is available, the timeformat module will integrate itself with it:
>>> import os >>> import tempfile >>> from zope.publisher.browser import TestRequest>>> temp_file = tempfile.mkstemp()[1] >>> open(temp_file, 'w').write(""" ... <html> ... <body tal:define="mydatetime python:modules['datetime'].datetime(1975, 12, 17, 5, 24, 36)"> ... RFC 2822 date : <span tal:replace="timefmt:rfc2822:mydatetime" /> ... Medium Date : <span tal:replace="ltimefmt:date:medium:mydatetime" /> ... Medium DateTime : <span tal:replace="ltimefmt:dateTime:medium:mydatetime" /> ... Python Expr (ltimefmt): <span tal:replace="ltimefmt:dateTime:long:python:modules['datetime'].date(1975, 12, 17)" /> ... Python Expr (timefmt) : <span tal:replace="timefmt:rfc2822:python:modules['datetime'].date(1975, 12, 17)" /> ... </body> ... </html> ... """)>>> from zope.app.pagetemplate.simpleviewclass import SimpleViewClass >>> Page = SimpleViewClass(temp_file, name='main.html') >>> request = TestRequest() >>> print Page(None, request)().strip() # doctest: +NORMALIZE_WHITESPACE <html> <body> RFC 2822 date : Wed, 17 Dec 1975 05:24:36 +0000 Medium Date : 1975 12 17 Medium DateTime : 1975 12 17 05:24:36 Python Expr (ltimefmt): 1975 12 17 00:00:00 +000 Python Expr (timefmt) : Wed, 17 Dec 1975 00:00:00 +0000 </body> </html>
Using the german locale:
>>> request = TestRequest(environ={'HTTP_ACCEPT_LANGUAGE': 'de-de'})
>>> print Page(None, request)().strip()
<html>
<body>
RFC 2822 date : Wed, 17 Dec 1975 05:24:36 +0000
Medium Date : 17.12.1975
Medium DateTime : 17.12.1975 05:24:36
Python Expr (ltimefmt): 17. Dezember 1975 00:00:00 +000
Python Expr (timefmt) : Wed, 17 Dec 1975 00:00:00 +0000
</body>
</html>
Let’s see if it works with spaces after the colon (at various places):
>>> open(temp_file, 'w').write(""" ... <html> ... <body tal:define="mydatetime python:modules['datetime'].datetime(1975, 12, 17, 5, 24, 36)"> ... RFC 2822 date : <span tal:replace="timefmt: rfc2822:mydatetime" /> ... Medium Date : <span tal:replace="ltimefmt: date: medium:mydatetime" /> ... Medium DateTime : <span tal:replace="ltimefmt: dateTime:medium: mydatetime" /> ... Python Expr (ltimefmt): <span tal:replace="ltimefmt: dateTime:long: python:modules['datetime'].date(1975, 12, 17)" /> ... Python Expr (timefmt) : <span tal:replace="timefmt: rfc2822: python:modules['datetime'].date(1975, 12, 17)" /> ... </body> ... </html> ... """)>>> Page = SimpleViewClass(temp_file, name='main_with_spaces.html') >>> request = TestRequest() >>> print Page(None, request)().strip() # doctest: +NORMALIZE_WHITESPACE <html> <body> RFC 2822 date : Wed, 17 Dec 1975 05:24:36 +0000 Medium Date : 1975 12 17 Medium DateTime : 1975 12 17 05:24:36 Python Expr (ltimefmt): 1975 12 17 00:00:00 +000 Python Expr (timefmt) : Wed, 17 Dec 1975 00:00:00 +0000 </body> </html>
CleanUp:
>>> os.remove(temp_file)
Changes
1.1.0 (2010-01-20)
Features:
Accept None as an argument for timefmt and ltimefmt. These functions will now return None in this case instead of erroring.
Bugfixes:
Re-add tests mistakenly removed.
Update dependencies: van.testing is only needed for tests.
Update tests to run with new ZTK packages.
Add author e-mail.
1.0.0 (2008-11-21)
Initial Release
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