Input
Preparing your workspace…
How to use
- Choose the start and end dates.
- Set the zone and choose date-only, include-end or time options.
- Read the calendar interval and totals; copy or download the result.
Calendar distance and elapsed time
A calendar interval describes years, months and days between dates. Elapsed time measures the duration between the corresponding instants; the two answers serve different questions.
For a date range, count calendar dates and decide whether to include the end date. Enable clock times when hours, minutes or a time-zone transition matter to the comparison.
Choosing the counting mode
Date-only mode compares calendar dates and can include the end date. With clock times enabled, totals are based on the elapsed interval rather than a count of date labels.
2026-03-07 12:00 → 2026-03-08 12:00
America/New_YorkP1D
PT82800SClock-time comparison across the New York spring DST change: one calendar day but 82,800 elapsed seconds.
Calendar days and DST
A local calendar day across a daylight-saving change may contain 23 or 25 hours. That is why a one-day calendar difference can disagree with an elapsed total divided into 24-hour periods.
Reading the totals
The readable result summarizes calendar units. Precision details expose the start, end, duration and total values; copy the value relevant to your task or download the complete JSON result.
ISO calendar dates, nanosecond precision and explicit time zones. Cron uses five fields, up to 50 runs within 10 years, reference years 1900–2199 and a 5-second processing limit. Time-zone data comes from your browser. Processing stays on your device.
Frequently asked questions
Can the difference be negative?
Yes. An end before the start produces a signed difference. Swap the dates when you want the forward interval.
Are months treated as 30 days?
No. Calendar months depend on the dates involved. Elapsed totals are calculated from the represented instants.
What does Include end date do?
In date-only mode, it extends the counted range to include the end date. It is not an extra 24-hour adjustment for a clock-time comparison.
Why is one calendar day sometimes 23 hours?
A daylight-saving transition can change the local offset between the start and end. The elapsed interval then differs from a fixed 24-hour day.
Can this count business days or holidays?
No. It compares calendar dates and elapsed time. It does not apply working-week patterns or regional holiday calendars.