Django since filter

since_filter.py

import datetime
from django import template
from django.utils.timezone import is_aware, utc
from django.utils.translation import ungettext, ugettext

register = template.Library()

@register.filter(is_safe=False)
def since(date, stop_at_month=False):
    """Formats a date as the time since that date (i.e. "4 days ago").
    
    Stolen from
    * django.utils.timesince.py
    * https://github.com/playframework/play/blob/master/framework/src/play/templates/JavaExtensions.java
    * http://djangosnippets.org/snippets/2275/
    """
    # Convert datetime.date to datetime.datetime for comparison.
    if not isinstance(date, datetime.datetime):
        date = datetime.datetime(date.year, date.month, date.day)

    now = datetime.datetime.now(utc if is_aware(date) else None)

    if now < date:
        # date is in the future compared to now, stop processing.
        return u''

    delta = now - date
    seconds = delta.days * 24 * 60 * 60 + delta.seconds

    #if seconds < 60:
    #    return ugettext(u"just a few seconds ago")

    if seconds < 60:
        return ungettext(u"%d second ago", u"%d seconds ago", seconds) % seconds

    if seconds < 3600:  # 60 * 60
        minutes = seconds // 60
        return ungettext(u"%d minute ago", u"%d minutes ago", minutes) % minutes

    if seconds < 86400:  # 24 * 30 * 30
        hours = seconds // 3600
        return ungettext(u"%d hour ago", u"%d hours ago", hours) % hours

    if seconds < 172800:  # 2 * 24 * 60 * 60
        return ugettext(u"yesterday")

    if seconds < 259200:  # 3 * 24 * 60 * 60
        return ugettext(u"2 days ago")

    if seconds < 2592000:  # 30 * 24 * 60 * 60
        days = seconds // 86400
        return ungettext(u"%d day ago", u"%d days ago", days) % days

    if stop_at_month:
        return date.date()

    if seconds < 31536000:  # 365 * 24 * 60 * 60
        months = seconds // 2592000
        return ungettext(u"%d month ago", u"%d months ago", months) % months

    years = seconds // 31536000
    return ungettext(u"%d year ago", u"%d years ago", years) % years