Use strptime at import time to avoid a race
Use strptime at import time to avoid a race

Summary:
We've observed funny AttributeErrors and similar in accessing _strptime, which
are likely the result of a known race. This might possibly fix it.

Test Plan: None

Reviewers: benjamin

Reviewed By: benjamin

Subscribers: changesbot, anupc

Differential Revision: https://tails.corp.dropbox.com/D225912

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