Changes at the U.S. Postal Service are forcing people who rely on postmarks when voting, filing taxes or mailing legal documents to be extra careful when cutting it close to deadlines.

Postmarks include the dates that USPS stamps on envelopes, and those are often used to determine whether a piece of first-class mail was sent on time.

But the Postal Service has proposed revising its mailing standards to say that postmark date “does not inherently or necessarily align” with the date that a mail piece was first accepted by a letter carrier or dropped off at a post office or collection box.

“In other words, the date on a machine-applied postmark may reflect the date on which the mailpiece was first accepted by the Postal Service, but that is not definitively the case,” USPS said in a

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