Fix first day of datepicker

[georgehrke]

before:

after:

[codecov]

Codecov Report

Merging #1314 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1314   +/-   ##
=======================================
  Coverage   62.31%   62.31%           
=======================================
  Files           4        4           
  Lines          69       69           
=======================================
  Hits           43       43           
  Misses         26       26

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