Date & Time Tools
Date calculation, age calculator, and calendar tools
Date Calculator
Calculate days between two dates instantly. Check elapsed or remaining days easily.
Age Calculator
Calculate current age from birthdate. Display detailed years, months, and days.
Time Calculator
Easily add or subtract time. Perfect for calculating work hours and task duration.
Japanese Era Converter
Convert between the Western (Gregorian) calendar and Japan's unique "Wareki" era-based calendar system. Supports 5 eras: Reiwa, Heisei, Showa, Taisho, and Meiji.
Countdown Timer
Start a countdown from a specified time. Set hours, minutes, and seconds with alarm notification.
Stopwatch
An online stopwatch you can use in your browser. Record and display lap times with ease.
Pomodoro Timer
Boost focus with the Pomodoro Technique. Automatically manages 25-minute work + 5-minute break cycles.
World Clock
View current times around the world at a glance. Compare multiple time zones side by side.
Work Hours Calculator
Calculate work hours from clock-in and clock-out times. Automatically deducts break time.
Day of the Week Calculator
Instantly find the day of the week for any date. Works for both past and future dates.
Leap Year Checker
Instantly determine whether a given year is a leap year. Also shows when the next leap year occurs.
Week Number Calculator
Find the ISO 8601 week number for any date. View the full year calendar with week numbers.
Day Counter
Calculate days remaining until or elapsed since a specified date. View results in days, weeks, months, and years.