Fixed tests for returning an instance of `Time` in the local system timezone.
Merge pull request #9653 from jetthoughts/master

Fixed tests `to_time` returning an instance of `Time` in the local system timezone.

Tests for to_time returning an instance of Time in the local system timezone did not take in account DST when they used mixed timezone declarations like 'US/Eastern' and '-0500'.

Replaced timezone with DST by timezone without DST.