Fix date parsing to correctly handle timezone formats

[mattwiller]

No description provided.

[boxcla]

Verified that @mattwiller has signed the CLA. Thanks for the pull request!

[coveralls]

Pull Request Test Coverage Report for Build 1860

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.002%) to 62.046%

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Totals
Change from base Build 1856:	-0.002%
Covered Lines:	4968
Relevant Lines:	8007

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1858

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 62.06%

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Totals
Change from base Build 1856:	0.01%
Covered Lines:	4971
Relevant Lines:	8010

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💛 - Coveralls