Revisions time double-adjusting for timezone

My offset is -0500, and when I upload a new revision, it appears that I uploaded it 5 hours ago:

![screen shot 2014-05-08 at 11 04 15 am](https://cloud.githubusercontent.com/assets/102265/2917135/600b606a-d6c2-11e3-9276-f141bfdea408.png)