Dates and Times | SheetJS Community Edition
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File Format Support (click to show)
On this page File Format Support (click to show) Dates are a core concept in nearly every spreadsheet application in existence. Some legacy spreadsheet apps only supported dates. Others supported times as a distinct concept from dates. Some file formats store dates in a textual format, while others store dates with numbers representing a difference from an epoch . Many spreadsheet apps use special number formats to signal that values are dates or times. Quattro Pro for DOS had a distinct set of Date number formats and Time number formats, but did not have a mixed Date + Time format. OpenOffice
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