fix(datepicker): issues in UTC+x time zones when ng-model-options="{timezone: 'UTC'}" is set

[vdrasutis]

…9: https://github.com/angular/material/issues/12149

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[vdrasutis]

P.S. I think this fix will be ok when passed time zone is UTC +00:00 - but when different time zone is passed might not work properly initial (to create midnight by passed time zone).