Count number of days in year from the given date in Excel
Kutools for Excel
Generally, a year has 365 days, but four years a leap year, which has 366 days. For quickly finding the given date if a leap year and counting the number of days in the year in Excel, the Kutools for Excel’ Calculate days in year feature can help you.
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Count days in year
Select a cell that you will place the counted result, then click Kutools > Formula Helper > Math & Trig > Calculate days in year. See screenshot:
In the popping Formulas Helper dialog, go to Date section to click the browse button 
to choose a cell that you want to count the days of year based on.
Note: The selected cell will be shown as absolute reference in the Date section, you can change it to relative reference for filling the formula to other cells by dragging auto fill handle.
Click Ok, the days of year has been counted.
Remark
In the Date section, you also can directly type in the date that you want to count days of year into the textbox, make sure the date format is m/d/yyyy.
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Kutools for Excel: More than 300 Advanced Functions for Excel 2021, 2019, 2016, 2013, 2010, 2007 and Office 365.
Kutools for Excel
The functionality described above is just one of 300 powerful functions of Kutools for Excel.
Designed for Excel(Office) 2021, 2019, 2016, 2013, 2010, 2007 and Office 365. Free download and use for 60 days.
