Date & Time Calculators
A hub for every date calculation you need β days between dates, business days, week numbers, day of the week, countdowns, age, time arithmetic, and the Japanese era and zodiac. Pick a tool below to get started.
Date Difference Calculator
Calculate the number of days between two dates
Business Days Calculator
Count working days excluding weekends and public holidays. Supports Japan and the US, with holidays computed automatically so they are always current.
Countdown Calculator
Count how many days are left until an event, anniversary, birthday or holiday. Supports any date, yearly anniversaries and the next holiday.
Week Number Calculator
Get the ISO week number for any date, and convert a week number back to dates.
Day of the Week Calculator
Find what day of the week any date falls on, with the ISO week number, day of year, leap-year status, days from today, and zodiac sign.
Date Calculator
Add or subtract days, weeks, months, and years, or count business days
Age Calculator
Calculate exact age in years, months, days, and more
Time Calculator
Add and subtract time, find the duration between two times, and add or subtract a duration to a clock time.
Japanese Era & Chinese Zodiac Calculator
Convert between Gregorian years and Japanese eras (Meiji, TaishΕ, ShΕwa, Heisei, Reiwa) and find the zodiac sign (sexagenary cycle) for any year.