YSK You aren’t supposed to use apostrophes to pluralize years.

GatoB@lemmy.world to You Should Know@lemmy.world – 91 points –

It’s 1900s, not 1900’s. You only use an apostrophe when you’re omitting the first two digits: ‘90s, not 90’s or ‘90’s.

Why YSK: It’s an incredibly common error and can detract from academic writing as it is factually incorrect punctuation.

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Same when you pluralize an initialism or acronym. ATMs not ATM's. Unless it is needed for clarity. If you had the acronym "AS" you might choose AS's instead of ASs.