The U.S. Postal Service , FedEx, and UPS have posted holiday shipping deadlines.

Christmas is only days away, and Hanukkah starts in mid-December this year. If you haven't shipped holiday gifts yet, the window for your presents to arrive on time is closing.

If you can ship early, that's the safest route. Package carriers have warned that the shipping dates are estimates that depend on several factors like the volume of packages and local weather conditions. And each carrier encourages checking its website for the most current updates for anyone sending gifts internationally or managing a large shipment.

Here's what you need to know about when major holidays are this season and the U.S. Postal Service, FedEx and UPS mail-by dates from Mississippi .

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