Fix unit tests that can be failed due to daylight saving time

[tofpie]

This Pull Request fixes #967.

It changes the following:

• Unit tests date_proto_to_time_string and date_proto_to_string

[codecov]

Codecov Report

Merging #968 (66fc4cd) into master (8f388d5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #968   +/-   ##
=======================================
  Coverage   59.40%   59.40%           
=======================================
  Files         166      166           
  Lines       10717    10717           
=======================================
  Hits         6366     6366           
  Misses       4351     4351           

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[Razican]

Thanks! :) this solves the issue, yes.