Template tags for converting UTC to local time

[wolever]

I've written a bunch of template tags which convert UTC datetimes and timestamps to a local timezone. For example:

Last modified: {% localdt item.modified_utc %} ({% localtimesince time.modified_utc %})

Which converts the input datetimes to the timezone specified by the localtz context variable (it can also be explicitly specified, and all those other sensible things).

Would such a patch be accepted?