Days until Earth Day
Earth Day 2027 is on Thursday, April 22, 2027. The count starts from today’s date; pick another date to count from it instead.
- Days until Earth Day
- 205
From September 29, 2026, there are 205 days until Earth Day on Thursday, April 22, 2027.
- Date
- Thursday, April 22, 2027
- Day of the week
- Thursday
- In weeks
- 29 weeks and 2 days
Answer for the example date Tuesday, September 29, 2026. It changes to today's date when the page loads.
Days until Earth Day: 205. From September 29, 2026, there are 205 days until Earth Day on Thursday, April 22, 2027.
Where is Earth Day on the calendar?
How to calculate
Counts the days from today, or any date you choose, to the next Earth Day, with its date and day of the week.
Example with the default inputs (Count from September 29, 2026) on the example date Tuesday, September 29, 2026: From September 29, 2026, there are 205 days until Earth Day on Thursday, April 22, 2027.
Method: Find the first date of Earth Day on or after the start date, then count the days from the start date to it.
- Earth Day is April 22 every year.
- Start dates from January 1, 1970 to December 31, 2400 work, because the first Earth Day was on April 22, 1970.
- The start date itself is not counted: from the day before, the count is 1; on the day itself, it is 0.
- Dates are calendar days with no time of day, so a time zone or a daylight-saving change never adds or loses a day.
Worked examples
Each example is checked against the calculator on every build.
- Count from 2026-01-01 gives Date 2026-04-22, Days until Earth Day 111.Source: the rule written again in Python 3 (datetime); docs/progress/WP-43.md
- Count from 2026-04-23 gives Date 2027-04-22, Days until Earth Day 364.Source: the rule written again in Python 3 (datetime); docs/progress/WP-43.md
Other questions people ask
When is Earth Day 2027?
Earth Day 2027 is on Thursday, April 22, 2027.
When is Earth Day 2028?
Earth Day 2028 is on Saturday, April 22, 2028.
How is the date of Earth Day set?
Earth Day is April 22 every year. Source: the rule written again in Python 3 (datetime).
How are the days until Earth Day counted?
From the start date (today, unless you change it) to the date, without counting the start date. The day before, the count is 1; on the day itself, it is 0; the day after, the count moves on to the next Earth Day.