Django template timesince filter - limit

Is it possible to lim开发者_运维技巧it django timesince filter say to 7 days. If date is more than 7 days, don't apply the filter

The source for timesince is located under django/django/utils/timesince.py. It's short and should require no great effort, to modify it to accept another argument, if some time (e.g. 7 days) is exceeded.