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class DateCreatedAndUpdate(models.Model):
    """
    Abstract class used to populate childern with a `date_created` field
    """
    class Meta:
        abstract, ordering = True, ("-id",)
    date_created = models.DateTimeField(auto_now_add=True)
    date_updated = models.DateTimeField(auto_now=True)

    def time_past_since_creation(self):
        time = (timezone.now()-self.date_created)
        hours = time.seconds / 60 / 60
        weeks = time.days / 7
        return "Weeks: {weeks}, Days: {days}, Hours: {hours}, Seconds: {seconds}".format(
            days=time.days, seconds=time.seconds, weeks=weeks, hours=hours
        )