Christmas is December 25th.. Hanukkah begins on December 28th. If you want to make sure your gifts  get to their intended destinations on time, ship them as early as possible. Changes to the post office’s delivery schedule and an expected package avalanche because of record online shopping means you’ve got a good chance of your gifts not getting there on time.
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Source: LifeHacker.com, 11/4/21

Why did they change USPS delivery schedules ?