Time & Date

Time zones, date differences, business days, timers, stopwatch and world clock

Convert between time zones, count the days or business days between dates, add or subtract durations, find ISO week numbers and plan meetings across time zones. Timers, a stopwatch, a Pomodoro timer and a world clock run in your browser. Time zone and daylight-saving rules come from your browser’s built-in time zone database.

Tools in this category: 15

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Age Calculator

Calculate exact age in years, months and days from a date of birth, plus total months, weeks, days, the next birthday and leap-day handling.
Business Days Calculator

Count working days between two dates or add business days to a date, with custom weekends and public holidays for 200+ countries.
Countdown Timer

Free online countdown timer: set hours, minutes and seconds or count down to a date and time, with alarm sound, notifications and a progress bar.
Date Calculator

Add or subtract years, months, weeks, days, hours and minutes to a date. Shows the resulting weekday and ISO date and explains month-end clamping.
Date Difference Calculator

Count the days between two dates or date-times: years, months and days breakdown plus total weeks, hours, minutes and seconds, inclusive option.
Date Formatter

Format any date with Moment.js, strftime or Unicode LDML patterns, see ISO 8601, RFC 2822, HTTP and Unix formats, and parse custom date strings.
Public Holidays by Country

List public holidays for 200+ countries and their regions for any year from 1900 to 2200, with local holiday names, weekdays and the next holiday.
Meeting Planner

Find meeting times that fit everyone's working hours across time zones. DST-aware hour grid, overlap windows and the best partial overlap.
Pomodoro Timer

Free Pomodoro timer with adjustable focus, short and long break lengths, long break interval, auto-start, alarm sound and session counter.
Online Stopwatch

Free online stopwatch with lap and split times, fastest and slowest lap highlights and keyboard shortcuts. Stays accurate in background tabs.
Time Adder

Add up a list of times in hh:mm:ss, minutes or 1h 30m format, subtract entries, get totals in hours and decimal hours, and add the sum to a clock time.
Time Duration Calculator

Calculate hours and minutes between two times, including overnight shifts, add several intervals, subtract breaks and convert to decimal hours.
Time Zone Converter

Convert a date and time from any IANA time zone to several others at once. Correct DST offsets for the exact date, gap and overlap warnings.
Week Number Calculator

Find the ISO 8601 week number and week-year of any date, the US week number and day of year, or get the dates of a given week number.
World Clock

Live world clock showing the current time, date, UTC offset and difference from your time for the cities you choose. Your list is saved locally.

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