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+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2003-2006 Edgewall Software
+# Copyright (C) 2003-2004 Jonas Borgström <jonas@edgewall.com>
+# Copyright (C) 2006 Matthew Good <trac@matt-good.net>
+# Copyright (C) 2005-2006 Christian Boos <cboos@neuf.fr>
+# All rights reserved.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at http://trac.edgewall.com/license.html.
+#
+# This software consists of voluntary contributions made by many
+# individuals. For exact contribution history, see the revision
+# history and logs, available at http://projects.edgewall.com/trac/.
+#
+# Author: Jonas Borgström <jonas@edgewall.com>
+#         Matthew Good <trac@matt-good.net>
+
+import locale
+import sys
+import time
+
+# Date/time utilities
+
+def pretty_timedelta(time1, time2=None, resolution=None):
+    """Calculate time delta (inaccurately, only for decorative purposes ;-) for
+    prettyprinting. If time1 is None, the current time is used."""
+    if not time1: time1 = time.time()
+    if not time2: time2 = time.time()
+    if time1 > time2:
+        time2, time1 = time1, time2
+    units = ((3600 * 24 * 365, 'year',   'years'),
+             (3600 * 24 * 30,  'month',  'months'),
+             (3600 * 24 * 7,   'week',   'weeks'),
+             (3600 * 24,       'day',    'days'),
+             (3600,            'hour',   'hours'),
+             (60,              'minute', 'minutes'))
+    age_s = int(time2 - time1)
+    if resolution and age_s < resolution:
+        return ''
+    if age_s < 60:
+        return '%i second%s' % (age_s, age_s != 1 and 's' or '')
+    for u, unit, unit_plural in units:
+        r = float(age_s) / float(u)
+        if r >= 0.9:
+            r = int(round(r))
+            return '%d %s' % (r, r == 1 and unit or unit_plural)
+    return ''
+
+def format_datetime(t=None, format='%x %X', gmt=False):
+    if t is None:
+        t = time.time()
+    if not isinstance(t, (list, tuple, time.struct_time)):
+        if gmt:
+            t = time.gmtime(int(t))
+        else:
+            t = time.localtime(int(t))
+
+    text = time.strftime(format, t)
+    encoding = locale.getpreferredencoding()
+    if sys.platform != 'win32':
+        encoding = locale.getlocale(locale.LC_TIME)[1] or encoding
+        # the above is broken on win32, e.g. we'd get '437' instead of 'cp437'
+    return unicode(text, encoding, 'replace')
+
+def format_date(t=None, format='%x', gmt=False):
+    return format_datetime(t, format, gmt)
+
+def format_time(t=None, format='%X', gmt=False):
+    return format_datetime(t, format, gmt)
+
+def get_date_format_hint():
+    t = time.localtime(0)
+    t = (1999, 10, 29, t[3], t[4], t[5], t[6], t[7], t[8])
+    tmpl = format_date(t)
+    return tmpl.replace('1999', 'YYYY', 1).replace('99', 'YY', 1) \
+               .replace('10', 'MM', 1).replace('29', 'DD', 1)
+
+def get_datetime_format_hint():
+    t = time.localtime(0)
+    t = (1999, 10, 29, 23, 59, 58, t[6], t[7], t[8])
+    tmpl = format_datetime(t)
+    return tmpl.replace('1999', 'YYYY', 1).replace('99', 'YY', 1) \
+               .replace('10', 'MM', 1).replace('29', 'DD', 1) \
+               .replace('23', 'hh', 1).replace('59', 'mm', 1) \
+               .replace('58', 'ss', 1)
+
+def http_date(t=None):
+    """Format t as a rfc822 timestamp"""
+    if t is None:
+        t = time.time()
+    if not isinstance(t, (list, tuple, time.struct_time)):
+        t = time.gmtime(int(t))
+    weekdays = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
+    months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
+              'Oct', 'Nov', 'Dec']
+    return '%s, %02d %s %04d %02d:%02d:%02d GMT' % (
+           weekdays[t.tm_wday], t.tm_mday, months[t.tm_mon - 1], t.tm_year,
+           t.tm_hour, t.tm_min, t.tm_sec)
+
+def parse_date(text):
+    seconds = None
+    text = text.strip()
+    for format in ['%x %X', '%x, %X', '%X %x', '%X, %x', '%x', '%c',
+                   '%b %d, %Y']:
+        try:
+            date = time.strptime(text, format)
+            seconds = time.mktime(date)
+            break
+        except ValueError:
+            continue
+    if seconds == None:
+        raise ValueError, '%s is not a known date format.' % text
+    return seconds