Practical tools for measured work
Date duration calculator
Count calendar days, weekdays and weekends, or add and subtract days.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
Calendar date calculation
How it works
Count dates from the start date up to, but not including, the end date. Include the end date to count both endpoints. From 28 February to 1 March 2024 there are two days, or three inclusive days. Adding days accepts signed whole numbers.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Calculation
- Days between dates
- Start date
- 2024-02-28
- End date
- 2024-03-01
- Include end date
- No
Primary result: Calendar days: 2.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
Gregorian calendar dates from year 0001 through 9999. Calendar days are not elapsed 24-hour periods across daylight-saving changes. Weekdays exclude Saturday and Sunday but include public holidays.
Frequently asked questions
Are public holidays excluded?
No. Weekday counts exclude only Saturday and Sunday. Apply the relevant holiday calendar separately.
Elapsed date and time
How it works
Dates and times are interpreted in the selected IANA zone before their UTC instants are subtracted. In New York on 10 March 2024, 01:30 to 03:30 is one elapsed hour because the clock skips forward.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Start date and time
- 2024-03-10T01:30
- End date and time
- 2024-03-10T03:30
- IANA time zone
- America/New_York
- Start repeated-time occurrence
- Earlier occurrence
- End repeated-time occurrence
- Earlier occurrence
Primary result: Elapsed hours: 1.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
Skipped local times are invalid. For repeated times choose the intended occurrence at each endpoint. The end instant must not precede the start. Browser time-zone rules apply; leap seconds are excluded.
Frequently asked questions
Why does elapsed time differ from calendar time?
A clock change alters the relationship between local time and UTC. Use calendar days for date counting and UTC elapsed hours for physical duration.
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