To abbreviate a year, you can use an apostrophe (') before the last two digits:
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2023 becomes '23
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1999 becomes '99
Here's what to keep in mind:
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Don't put the apostrophe after the digits. For example, 2023 wouldn't be written as 2023'.
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This abbreviation is best used in informal contexts or when space is limited. In formal writing, it's usually better to write out the full year.
Additionally:
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You can abbreviate "years" as "yrs" and "year" as "yr" for quick notes or informal writing.
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For a range of years, use an en dash (–) between them. For example: 1960–1970.