Day of Year Calculator to
Calculate Day Number and Days Left

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Use the Day of Year Calculator on this page to instantly calculate what day number of the year a date represents!

This free online date calculator will determine how many days have passed in the entered year (including the date), plus calculate the total number of days in the entered year, as well as the number of days left.

Just select the month and day, enter the 4-digit year, click the button, and viola!

Have a goal you would like to accomplish by the end of the year? This calculator will help you to break down the goal into day-size chunks (e.g., 1-hour per day for the rest of the year equals X number of hours).

Day Number of the Year Calculator
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Instructions: Select the month and day and enter the year for the date you wish to calculate the day number for, then click the "Calculate Day of the Year" button.

Mouse over the blue question marks for a further explanation of each entry field. More in-depth explanations can be found in the glossary of terms located beneath the Day Number of the Year Calculator.

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Help Select the date to calculate the day number of:
Help Day of the year:
Help Number of days left in the year:
Help Total number of days in year:
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Day of Year Calculator Glossary of Terms

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Date to calculate the day number of: Select the month and day of the year from the drop-down menus and enter the 4-digit year for the date you wish to calculate the day number for.

Day of the year: This is the day of the year for the entered date.

Number of days left in the year: This is the number of days that are left in the entered year.

Total number of days in year: This is the total number of days in the entered year. Note that the calculations do account for leap years.

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