Note:dates are serial numbersin Excel, and begin on January 1, 1900.

Dates before 1900 are not supported.

To display date values in a human-readable date format, apply thenumber formatof your choice.

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you could use the DAY function to extract a day number from a date into a cell.

Excel formula: Get percent of year complete

Excel formula: Year is a leap year

Excel formula: Get year from date

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Excel formula: Convert date to Julian format

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Excel formula: Date is same month and year

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Excel YEAR function

Excel MONTH function

Excel DAY function

Excel DATE function