Dates, clock times, and timestamps are different inputs
Time questions can sound similar while using different conventions. A date range, two clock readings, and an epoch timestamp do not contain the same information.
A date range counts calendar days
From 1 November to 5 November, four days elapse. If you mean every study date including the first and the last, count five dates. Neither convention is universally right for every task. Daykit’s date calculator labels the inclusive option and includes weekends and holidays. A rule specifying working days requires a different calculation and an appropriate holiday calendar.
A clock reading needs a day
09:00 to 17:00 on one day is eight hours. 22:00 to 06:00 needs an overnight assumption before the difference makes sense. The time duration tool requires you to select the following day rather than guessing. Subtract a break only if it belongs outside the period you want to measure. The calculator does not decide workplace policies or payable time.
Minutes are not hundredths of an hour
Seven hours and thirty minutes is 7.5 hours because thirty is half of sixty. A value of 7.30 decimal hours is seven hours and eighteen minutes. Keep a duration such as 07:30:00 separate from its decimal-hours equivalent when transferring a result to a spreadsheet or another form. Label both representations if someone else will use your calculation.
A timestamp names an instant using a reference
Unix seconds and Unix milliseconds count different units relative to the same epoch. Daykit asks you to choose the unit and gives an ISO UTC representation. A UTC timestamp can be displayed as a different local clock reading elsewhere. That does not necessarily mean the underlying instant changed; it may mean the display applies a different timezone.
Know when a fixed 24-hour day is insufficient
Daykit’s calendar and simple clock tools are useful for planning, but they do not model daylight-saving transitions in local timezones. Actual elapsed clock hours across such a transition can differ from a simple day count times 24. If the exact instant matters, keep the timezone or UTC offset with the source event and use a system designed for timezone-aware records.
Use consistent duration when calculating pace
A pace calculation divides a duration by distance. Elapsed time and moving time can give different averages for the same route if one includes stops. Choose a convention and label it. The pace tool reports arithmetic from those inputs; it does not reconstruct a tracker’s measurements or prescribe an appropriate activity level.
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