Focused tool category

Free Online Date & Time Tools

Date and time tools for age, differences, date arithmetic, business days, weekdays, ISO weeks, countdowns, durations, timezone conversion and meeting-time planning.

13tools Focusedpurpose-built pages

13 tools shown

← Browse all tool categories

13 tools

Date & Time Tools

Date and time tools for age, differences, date arithmetic, business days, weekdays, ISO weeks, countdowns, durations, timezone conversion and meeting-time planning.

Calendar MakerCreate a clean printable monthly calendar with month, year, Sunday or Monday week start, custom title, notes and accent colour, then export PNG or PDF. Pomodoro TimerRun an adjustable focus-and-break Pomodoro timer directly in the browser with pause, reset and phase switching. Online StopwatchMeasure elapsed time with start, pause, reset and lap controls in a lightweight browser stopwatch. Age CalculatorCalculate exact age plus completed months, total weeks and days, and the date and countdown to the next birthday. Days Between DatesCalculate calendar or business days with configurable weekends and inclusive dates, or add/subtract days, weeks, months or years from a date. Date Add/Subtract CalculatorAdd or subtract calendar days, weeks, months or years while handling month-end date clamping. Business Days CalculatorCount business days across a date range with configurable weekends, endpoint inclusion and manually excluded holiday dates. Weekday CalculatorFind the weekday, day of year and ISO week for any valid calendar date. Week Number CalculatorCalculate the ISO week number and ISO week-year for a selected date. Countdown CalculatorRun a live local countdown to a target date and time with days, hours, minutes, seconds and total hours. Time Duration CalculatorCalculate exact elapsed duration between two local date-times in days, hours, minutes and seconds. Time Zone ConverterConvert a wall-clock date and time between IANA time zones using browser daylight-saving rules rather than fixed offsets. Meeting Time PlannerFind shared working-hour meeting slots across three IANA time zones for a selected date and meeting duration.

QuickConvertify category guide

Calculate dates, durations and time zones

What you can do here

Calculate age, days between dates, date addition and subtraction, business days, weekdays, ISO week numbers, countdowns and durations, or convert IANA time zones and find shared working-hour meeting slots with browser timezone rules.

How to choose the right tool

Check inclusive-day rules for legal or billing use and remember that timezone results can change across daylight-saving transitions. The timezone tools use browser IANA rules instead of static offset tables.

Check the finished result

Confirm date order, inclusive or exclusive counting, timezone, daylight-saving behavior and whether the result crosses midnight or a regional clock transition.

Need a different type of task? Browse the complete free online tools directory →