Peter 7374bcda25 Fixing bug with DateTime str test
An issue with local daylight savings time causes a comparison error in
some locales when checking against a hard-coded expected time string.
The DateTime primitive string representation has been updated to output
only UTC time strings.

Fixes #124
2016-04-05 14:00:14 -04:00
..
2016-03-21 11:11:46 -04:00
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2016-03-30 16:55:44 -04:00
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