Time & Date Calculators
Calculate hours, dates, durations, ages, time differences and other everyday time-based values.
About these tools
Time and date tools help with elapsed time, work hours, age, date differences, scheduling and everyday calendar calculations. Use the individual calculator that matches the question you are trying to answer rather than converting dates or durations manually.
Some time calculations depend on calendar rules, time zones or daylight-saving transitions. Tools that require those distinctions explain the assumptions they use so that a simple duration calculation is not confused with a time-zone conversion.
Browse Time & Date
Time Calculator
Add or subtract multiple time durations or calculate a clock time before or after a duration.
Open tool →Hours Calculator
Calculate hours between two times with overnight shifts, unpaid break deduction and decimal-hour results.
Open tool →Time Duration Calculator
Calculate exact elapsed time between two dates and times in weeks, days, hours, minutes and seconds.
Open tool →Date Difference Calculator
Calculate calendar difference, total days and weeks between two dates with optional inclusive end-date counting.
Open tool →Age Calculator
Calculate exact age in years, months and days, total days and weeks, birth weekday and next birthday.
Open tool →Days From Today Calculator
Add or subtract days, weeks, months or years from today or another starting date.
Open tool →Timer
Set a free online countdown timer with quick presets, pause, resume and an audible completion alert.
Open tool →Stopwatch
Use a free online stopwatch with start, pause, reset and lap-time tracking.
Open tool →World Clock
See the current time in major cities and time zones around the world.
Open tool →Time Zone Converter
Convert dates and times across multiple world time zones with IANA DST rules and UTC offsets.
Open tool →Business Days Calculator
Count working days and exclude weekends or holidays.
Open tool →Days Until Calculator
Count calendar days until or since any date with custom start date, weeks, weekday and inclusive counting.
Open tool →Calendar Generator
Create and print a monthly calendar for any selected month and year.
Open tool →Sunrise & Sunset Calculator
Estimate sunrise, sunset and daylight length from coordinates and date.
Open tool →How calculations and results are handled
Date and time tools use browser date handling or direct duration arithmetic depending on the task. Inputs, output units and important assumptions are shown on the individual tool pages.
Each individual tool page explains its own inputs, result and important limitations where additional context is useful.