How it works
Dates are treated as calendar dates without a timezone, avoiding errors caused by daylight-saving time changes. Both start and end are not counted inclusively.
FormulaDays = |UTC(second date) − UTC(first date)| ÷ 86,400,000.
EVERYDAY / DATES
← All toolsDays between dates
Measure the number of calendar days between any two dates.
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YOUR RESULT
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Days between dates: a worked example
With start date 2026-01-01, end date 2026-01-01, the days between dates is 0 days.
| Start date | 2026-01-01 |
|---|---|
| End date | 2026-01-01 |
| Days between dates | 0 days |
|---|---|
| Full weeks | 0 |
| Extra days | 0 days |
| Hours | 0 hours |
Amounts are shown in US dollars for illustration. Choose your own currency in the calculator above; it labels amounts and does not convert them.
Make the numbers useful
Try changing one input at a time. The live result helps you see which assumption has the greatest effect.
Use Save scenario A, change an input, and compare both results side-by-side. You can also share your settings using a link.
Modelled results are estimates. Independently check decisions involving health, finances or safety.
Frequently asked questions
How is the days between dates calculated?
Days = |UTC(second date) − UTC(first date)| ÷ 86,400,000. Dates are treated as calendar dates without a timezone, avoiding errors caused by daylight-saving time changes. Both start and end are not counted inclusively.
What does the days between dates example show?
With start date 2026-01-01, end date 2026-01-01, the days between dates is 0 days. Full weeks: 0; Extra days: 0 days; Hours: 0 hours.
What assumptions and limits apply?
This is an estimate based on the inputs and assumptions shown on this page, not professional advice. Check anything with financial, health or safety consequences independently.
Is my data private?
Yes. Calculations run in your browser and your numbers are not sent to a server. A share link contains the inputs you choose to share, so check it before sending it to anyone.