ipython/ipython — pull request #3525 by minrk (2013-07-03 19:18:47+00:00)
Title: basic timezone info

- minor tweaks to jsonutil, to include timezone info if available
- add `IPython.utils.tz`, which just has basic info for making `utcnow()`, etc. include tzinfo in the datetime object
- use this tzinfo in the `last_modified` keys in notebook managers, which fixes Firefox's timezone offset for checkpoints

closes #3396