app/django/utils/timesince.py
author Sverre Rabbelier <srabbelier@gmail.com>
Mon, 10 Nov 2008 00:41:54 +0000
changeset 459 2cfcedaf7c16
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Preparation for generic user views Added a getSuffixValues method that is meant to allow for having a non-public field as key_name. Also added support for a key-name field being embeded in the form so that if the key-fields change the old key_name is not lost.

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)