make dateparsing case insensitive
authorPhilipp Takacs <philipp@bureaucracy.de>
Sun, 1 Jan 2017 20:57:07 +0000 (21:57 +0100)
committerPhilipp Takacs <philipp@bureaucracy.de>
Fri, 6 Jan 2017 20:43:48 +0000 (21:43 +0100)
Acourding to RFC 5322 and 5234 the date field
is case insenitive


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