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This tutorial will teach you how to calculate a date’s day number of the year or find the nth day of the year. Examples work for Excel and Google Sheets.
Date’s Day Number of the Year
To calculate a date’s day number of the year you can calculate the difference between the date and the first day of the year:
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=B3-DATE(YEAR(B3),1,1)+1 |
Notice we need to add 1 to the end of the formula to calculate the correct day number. Instead we can set the day to 0 in the Date Function:
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=B3-DATE(YEAR(B3),1,0) |
nth Day of the Year
Conversely you can calculate the nth day of the year by adding n days to 12/31 of the previous year:
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=DATE(2020,1,0)+C3 |
Notice we do this by once again setting day =0 in the Date Function.
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Today’s Day Number
Use the TODAY Function to calculate today’s day number:
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= TODAY() - DATE(YEAR(TODAY()),1,0) |
Google Sheets – Day Number Of The Year
All of the above examples work exactly the same in Google Sheets as in Excel.
