[Zope-Checkins] CVS: Zope3/lib/python/Zope/Misc - standard_dates.py:1.1.2.1

[Jim Fulton]

Update of /cvs-repository/Zope3/lib/python/Zope/Misc
In directory cvs.zope.org:/tmp/cvs-serv24798

Added Files:
      Tag: Zope-3x-branch
	standard_dates.py 
Log Message:
Added module for generating date strings in some common date formats.
Code is copied from legacy App.Common module.


=== Added File Zope3/lib/python/Zope/Misc/standard_dates.py ===
##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
# 
##############################################################################
"""Commonly used utility functions.

Revision information: $Id: standard_dates.py,v 1.1.2.1 2002/01/12 22:33:13 jim Exp $
"""

__version__='$Revision: 1.1.2.1 $'[11:-2]

import time

# These are needed because the various date formats below must
# be in english per the RFCs. That means we can't use strftime,
# which is affected by different locale settings.
weekday_abbr = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
weekday_full = ['Monday', 'Tuesday', 'Wednesday', 'Thursday',
                'Friday', 'Saturday', 'Sunday']
monthname    = [None, 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']


def iso8601_date(ts=None):
    # Return an ISO 8601 formatted date string, required
    # for certain DAV properties.
    # '2000-11-10T16:21:09-08:00
    if ts is None: ts=time.time()
    return time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime(ts))

def rfc850_date(ts=None):
    # Return an HTTP-date formatted date string.
    # 'Friday, 10-Nov-00 16:21:09 GMT'
    if ts is None: ts=time.time()
    year, month, day, hh, mm, ss, wd, y, z = time.gmtime(ts)
    return "%s, %02d-%3s-%2s %02d:%02d:%02d GMT" % (
            weekday_full[wd],
            day, monthname[month],
            str(year)[2:],
            hh, mm, ss)

def rfc1123_date(ts=None):
    # Return an RFC 1123 format date string, required for
    # use in HTTP Date headers per the HTTP 1.1 spec.
    # 'Fri, 10 Nov 2000 16:21:09 GMT'
    if ts is None: ts=time.time()
    year, month, day, hh, mm, ss, wd, y, z = time.gmtime(ts)
    return "%s, %02d %3s %4d %02d:%02d:%02d GMT" % (weekday_abbr[wd],
                                                    day, monthname[month],
                                                    year,
                                                    hh, mm, ss)