Test robustness with respect to timezone

[felixwang9817]

Expected Behavior

Tests should be robust to timezone issues. In particular, tests should be refactored so that it is clear how we are handling timezone logic; right now, there is some logic spread throughout the integration tests, but it's extremely fragile (for example, it was recently broken by a small change which was fixed here).

Current Behavior

Steps to reproduce

Specifications

• Version:
• Platform:
• Subsystem:

Possible Solution

[stale]

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