4 calculators in this category
- Time Duration CalculatorISO 8601 time-of-day and duration conventionsEnter a start time and an end time and this calculator returns the elapsed span in hours, minutes and seconds, in decimal…
- Add & Subtract Time CalculatorSexagesimal (base-60) duration arithmeticAdd or subtract up to three durations written as hours, minutes and seconds, and get the answer in h:m:s, in decimal hours, in…
- Time Zone Converter CalculatorIANA Time Zone Database (tzdb) offset conventionsGive this calculator a date and time, the UTC offset of the zone it is written in and the UTC offset of the zone you want it…
- Daylight Saving Time Change Date CalculatorUS Energy Policy Act 2005; EU Directive 2000/84/ECDaylight saving transitions are defined by a rule, not by a published list, so you can compute them for any year. This…
Which one do you need?
- Time Duration Calculator
- Work out the elapsed time between a start and end time, including overnight shifts and multi-day spans, with breaks deducted and results in h:m:s and decimal hours.
- Add & Subtract Time Calculator
- Add and subtract durations in hours, minutes and seconds with correct carrying and borrowing. Get the total in h:m:s, decimal hours, minutes and seconds.
- Time Zone Converter Calculator
- Convert a date and time between any two time zones through UTC, with daylight saving handled explicitly and the date rollover shown so you never book the wrong day.
- Daylight Saving Time Change Date Calculator
- Find the exact daylight saving start and end dates for any year under US, EU, UK, Australian or New Zealand rules, plus days spent on summer time.