fix(test): use explicit time zones

[avivkeller]

Ref: #1 (comment)

CC @bmuenzenmeyer

[bmuenzenmeyer]

@avivkeller thanks so much for the fix - i suspected it was something like this.
looks like the feedback loop of the build approval and then CI is leaving us slow to iterate. if you dont have time to fix, I will soonish

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