+
−import datetime
+
−import time
+
−
+
−from django.utils.tzinfo import LocalTimezone
+
−from django.utils.translation import ungettext, ugettext
+
−
+
−def timesince(d, now=None):
+
−    """
+
−    Takes two datetime objects and returns the time between d and now
+
−    as a nicely formatted string, e.g. "10 minutes".  If d occurs after now,
+
−    then "0 minutes" is returned.
+
−
+
−    Units used are years, months, weeks, days, hours, and minutes.
+
−    Seconds and microseconds are ignored.  Up to two adjacent units will be
+
−    displayed.  For example, "2 weeks, 3 days" and "1 year, 3 months" are
+
−    possible outputs, but "2 weeks, 3 hours" and "1 year, 5 days" are not.
+
−
+
−    Adapted from http://blog.natbat.co.uk/archive/2003/Jun/14/time_since
+
−    """
+
−    chunks = (
+
−      (60 * 60 * 24 * 365, lambda n: ungettext('year', 'years', n)),
+
−      (60 * 60 * 24 * 30, lambda n: ungettext('month', 'months', n)),
+
−      (60 * 60 * 24 * 7, lambda n : ungettext('week', 'weeks', n)),
+
−      (60 * 60 * 24, lambda n : ungettext('day', 'days', n)),
+
−      (60 * 60, lambda n: ungettext('hour', 'hours', n)),
+
−      (60, lambda n: ungettext('minute', 'minutes', n))
+
−    )
+
−    # Convert datetime.date to datetime.datetime for comparison
+
−    if d.__class__ is not datetime.datetime:
+
−        d = datetime.datetime(d.year, d.month, d.day)
+
−
+
−    if not now:
+
−        if d.tzinfo:
+
−            now = datetime.datetime.now(LocalTimezone(d))
+
−        else:
+
−            now = datetime.datetime.now()
+
−
+
−    # ignore microsecond part of 'd' since we removed it from 'now'
+
−    delta = now - (d - datetime.timedelta(0, 0, d.microsecond))
+
−    since = delta.days * 24 * 60 * 60 + delta.seconds
+
−    if since <= 0:
+
−        # d is in the future compared to now, stop processing.
+
−        return u'0 ' + ugettext('minutes')
+
−    for i, (seconds, name) in enumerate(chunks):
+
−        count = since // seconds
+
−        if count != 0:
+
−            break
+
−    s = ugettext('%(number)d %(type)s') % {'number': count, 'type': name(count)}
+
−    if i + 1 < len(chunks):
+
−        # Now get the second item
+
−        seconds2, name2 = chunks[i + 1]
+
−        count2 = (since - (seconds * count)) // seconds2
+
−        if count2 != 0:
+
−            s += ugettext(', %(number)d %(type)s') % {'number': count2, 'type': name2(count2)}
+
−    return s
+
−
+
−def timeuntil(d, now=None):
+
−    """
+
−    Like timesince, but returns a string measuring the time until
+
−    the given time.
+
−    """
+
−    if not now:
+
−        if getattr(d, 'tzinfo', None):
+
−            now = datetime.datetime.now(LocalTimezone(d))
+
−        else:
+
−            now = datetime.datetime.now()
+
−    return timesince(now, d)