Date & time Between dates
Days ago calculator
From
Days
Unit
The date —
Day of the week —
ISO format —
Local · days and months are not interchangeable
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320 × 100
Counts backwards from a date. Enter a negative number of days to go back, or a positive one to go forward — the same arithmetic either way.
How to use the days ago calculator
1 Fill in the dates. The answer updates as you type.
2 The supporting figures underneath are the same span in other units.
3 Everything resolves in your browser — today’s date comes from your own device.
Counting back a fixed number of days is unambiguous in a way that counting back months is not: thirty days before 31 March is 1 March, and one month before 31 March is 28 February, and those are different dates for a good reason. If a deadline is defined in days, count days; if it is defined in months, count calendar months and accept that the end-of-month cases clamp. The distinction shows up in contracts constantly, and the phrase "within 30 days" and "within one month" are genuinely different obligations.
Questions
Enter a negative thirty and it counts back, including across month and year boundaries.
Sources
NIST — time and dateAdvertisement
300 × 250
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