Time and Date
Work with dates, durations, time zones and timestamps without counting on your fingers.
Date arithmetic is full of traps: leap years, month lengths, daylight saving and time zones that change by political decision. These tools apply the current rules rather than assuming a day is always 24 hours.
Add or take away years, months, weeks and days from a date, with month ends handled the way people mean them.
Countdown TimerSet a duration and let it run down, with an alarm at zero. Entirely in your browser.
Leap Year CalculatorCheck whether a year is a leap year under the Gregorian rule, see why, and find the next ones.
Pomodoro TimerWork and rest in alternating intervals, with every length adjustable. Entirely in your browser.
StopwatchTime something to the hundredth of a second, with laps. Entirely in your browser.
Time Zone ConverterConvert a date and time from one time zone to another, with the offsets and daylight saving actually in force that day.
Travel Time CalculatorHow long a drive takes from its distance and speed, stretch by stretch, with breaks, an arrival time and what driving faster saves.
Week Number CalculatorFind the ISO 8601 week a date falls in, or the dates a week number covers.
Work Hours CalculatorAdd up the hours worked each day, breaks taken off, in hours and minutes and in decimal hours for a timesheet.