[FIX] Gradient Clock: incorrect timezone handling

[danielsitnik]

This fixes an incorrect timezone handling on this app, as reported by user candido in the forums: https://discuss.tidbyt.com/t/the-time-on-the-new-clock-apps-are-two-hours-wrong/6543

@tpatel12 we need your approval here.

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[matslina]

LGTM, inclined to merge. @tpatel12 anything to add?