The Problem

I recently discovered that the default Silverlight DateTime format is different on MacOS than it is in Windows.

On Windows

On MacOS

There are a couple of differences, but the most noticeable is that time zone offset at the end of the time that shows on the Mac. On my computer the time zone offset shows as “-4:00” because I’m generating a DateTime in local time, which for me is currently Eastern Daylight Time (EDT), or 4 hours behind Coordinated Universal Time (UTC).

The application is following the best practice of storing all DateTimes ...