Dates, durations, zones, and timestamps
Date & Time Calculators
A complete set of focused calculators for calendar differences, exact elapsed time, working days, ages, time zones, units, ISO weeks, and Unix timestamps.
The practical outcome
Answer one precise date or time question with transparent boundary rules and calendar-aware calculations.
- 1Choose calendar-date, exact-time, or business-day logic for the question.
- 2Enter valid dates, times, zones, weekends, holidays, or units and review the stated assumptions.
- 3Copy or print the result when it is useful, then continue to a related date or time tool.
Recommended sequence
Tools in this collection
Calculate the calendar time between two dates in years, months, weeks, and days.
Open free tool →Find exact elapsed days, hours, minutes, and seconds between two date-times.
Open free tool →Calculate the time between two clock times, including periods that cross midnight.
Open free tool →Find the weekday for any valid date in the Gregorian calendar.
Open free tool →Move a date-time forward or backward by years, months, weeks, days, hours, minutes, or seconds.
Open free tool →Count working days between dates with inclusive options, custom weekends, and holidays.
Open free tool →Calculate age on today’s date or another selected date with calendar-accurate years, months, and days.
Open free tool →Convert a date and time between IANA time zones with daylight-saving changes applied.
Open free tool →Convert seconds, minutes, hours, days, weeks, months, and years using clearly stated assumptions.
Open free tool →Convert decimal hours to hours and minutes or convert clock-style hours and minutes to decimal time.
Open free tool →Find a date’s ISO week number, ISO week-year, week start, and week end.
Open free tool →Convert Unix seconds or milliseconds to readable date-time values and convert date-times back to Unix time.
Open free tool →Count the days between today and an event or deadline.
Open free tool →Continue planning
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