from django.utils.translation import ungettext, ugettext as _
from django.utils.encoding import force_unicode
from django import template
from django.template import defaultfilters
from datetime import date
import re

register = template.Library()

def mynaturalday(value, arg=None):
    """
    For date values that are tomorrow, today or yesterday compared to
    present day returns representing string. Otherwise, returns a string
    formatted according to settings.DATE_FORMAT.
    """
    try: 
        value1 = date(value.year, value.month, value.day)
    except AttributeError:
        # Passed value wasn't a date object
        return value
    except ValueError:
        # Date arguments out of range
        return value
    delta = value1 - date.today()
    if delta.days == 0:
        return _(u'today')
    elif delta.days == 1:
        return _(u'tomorrow')
    elif delta.days == -1:
        return _(u'yesterday')
    return defaultfilters.date(value, arg)
register.filter(mynaturalday)