Date calculators · Workdays & planning
Shift Rest Gap Calculator
Check elapsed rest between dated shifts for multiple people. Find overlapping shifts and gaps below a minimum you choose, with time-zone and DST handling.
Your calculation
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Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
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How to use this calculator
Select the shifts' time zone, minimum rest hours and repeated-time rule. Add each person's dated shift start and end. Calculate to inspect each chronological gap.
People are compared separately, ignoring name case. Each shift is checked against the latest previous end, so a short shift nested in a longer one cannot hide an overlap. Exactly meeting the entered threshold is sufficient. Shifts may last up to seven elapsed days.
A worked example
A shift ending at 22:00 followed by one starting at 08:00 the next date provides ten elapsed hours when no clock change intervenes. With an 11-hour threshold, the shortfall is one hour.
Does the result certify a lawful or safe roster?
No. Enter the threshold applicable to your planning. This arithmetic does not infer labor rules, exceptions, fatigue risk or contractual compliance.
Further reading: Source workflow and conventions. Your entered rules determine this result.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results inside that range. Most daily plans are limited to 366 dates; academic terms and sprint plans allow up to 731. Forms limit the number of entries to keep calculations responsive. Holidays and policy rules come from your inputs. Date-only plans ignore DST; tools with time-zone inputs use the browser's time-zone data and explicitly resolve repeated times. Calendar exports preserve date-only markers or exact timed events as appropriate. Calculations run only when requested, without background polling.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.