Summary:
Fixes T10633. When generating email about a transaction which adjusts a date, render the offset explicitly (like "UTC-7").
This makes it more clear in cases like this:
- mail is being sent to multiple users, and not necessarily using the viewer's settings;
- you get some mail while travelling and aren't sure which timezone setting it generated under.
Test Plan: Rendered in text mode, saw UTC offset.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10633
Differential Revision: https://secure.phabricator.com/D16287