Day of Year Calculator

Find the ordinal day number for any date, or turn a year and day number back into a date.

How to use day of year calculator

  1. Choose date-to-number or number-to-date
  2. Enter a date or a year and ordinal
  3. Read the result and remaining calendar days

Worked example

March 1, 2024

Day 61 of 366

How the result is calculated

January 1 is day 1. Leap years have 366 valid ordinals; other years have 365. This calendar ordinal is different from an astronomical Julian date.

Inputs stay in your browser. You can use this tool without joining the waitlist or creating an account.

From a calculation to a daily glance

See the year at a glance.

Choose a year progress widget in the app to keep the year’s passage visible without reopening a calculator.

  1. 1Choose a year progress style in the app.
  2. 2Add that Home Screen or Lock Screen widget.
  3. 3Keep the year’s passage visible at a glance.
Get early accessExplore widget designs

Web results do not automatically sync to the app. Setup is manual; calendar events appear through your enabled calendars.

Year14%
Year progress widget · example design from the app

Frequently asked questions

How does this day of year work?
January 1 is day 1. Leap years have 366 valid ordinals; other years have 365. This calendar ordinal is different from an astronomical Julian date.
How can I use the result with Monthly Calendar Widgets?
Choose a year progress widget in the app to keep the year’s passage visible without reopening a calculator.
Do I need an account to use this tool?
No. The tool works in your browser without an account. Your inputs are not sent to our servers. Downloaded files stay on your device.

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