Fix running tests in US time zones

[joshkel]

Tests within e2e/__tests__/customReportersOnCircus.test.ts were reporting started: invalid for me, because new Date(Date.now() - testCaseResult.startedAt).getDate() evaluated to 31 (i.e., Dec 31 1969) instead of 1 (Jan 1 1970 midnight UTC).

The intention is apparently to verify that the tests' startedAt is a valid timestamp, so I revised it accordingly.

The tests that I'm modifying were added in #15145.

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commit: 12c8a48

[cpojer]

👍 Dates, how do they work?