Date & Time Tools

A list of our Date & Time tools. Nothing you enter is sent to a server; it is all processed in your browser.

• Unix Timestamp Converter

  Converts between a Unix timestamp (epoch seconds or milliseconds) and a date/time, and shows the current timestamp.

• Cron Expression Simulator

  Explains a cron expression in plain English and lists its upcoming run times. Handy for checking crontab or GitHub Actions schedules.

• Japanese Era Converter

  Converts between the Japanese era calendar (Meiji, Taisho, Showa, Heisei, Reiwa) and the Western year, with an era reference table covering transition dates.

• Date Calculator

  Calculates the difference in days between two dates, or the date a set number of days before or after a given date, with an option to count both endpoints.

• Age Calculator

  Calculates the exact age, traditional East Asian age, days lived, and days until the next birthday from a date of birth, with a customizable reference date.

• Time Zone Converter & World Clock

  Converts a date and time to the local time in cities around the world at once, with daylight saving support, and doubles as a world clock.

• Japan Business Day Calculator & Holiday List

  Finds the date N business days away and counts business days in a range, skipping weekends and Japanese national holidays, and lists holidays by year.

• Printable Calendar Generator (Monthly & Yearly)

  Create a printable monthly or yearly calendar with optional Japanese holidays, ISO week numbers and a Sunday or Monday week start.

• Timer, Stopwatch & Pomodoro Timer

  A browser stopwatch with laps, a countdown timer, a Pomodoro timer, and a hidden-count challenge to stop at an exact time, with an alarm sound when time is up.

• Time Calculator

  Total work hours, add or subtract time, and convert between h:mm and decimal hours.

• Birthday Info (Zodiac, Star Sign, Birthstone)

  Look up the zodiac animal, star sign, birthstone, birth flower, and day of the week for any date of birth.

• Japanese School Grade Chart

  Looks up the Japanese school grade, entry year, and graduation year from a date of birth, or the birth dates for a grade, with early-born support and an adjustable school year.

• Anniversary Calculator

  List 100-day, monthly and yearly anniversary dates from a start date, with days remaining, plus a countdown to any event.

• Rokuyo & Lunar Calendar (Taian, Butsumetsu, Solar Terms)

  A monthly calendar showing rokuyo lucky days (Taian, Butsumetsu…), old lunar dates, 24 solar terms and holidays, plus a date lookup (1900–2100)

• Japanese Lucky Day Calendar (Tensha, Ichiryumanbai, Tora)

  Find Japanese lucky days (Tenshanichi, Ichiryumanbai, Tora, Mi) and unlucky Fujoju days. Filter by wedding, business launch or wallet.

• Nine Star Ki (Kyusei Kigaku) Calculator

  Look up your Nine Star Ki year star and month star from your birth date, with element and a year-to-star chart.

• Shift Schedule Maker (Auto-Assign, Printable)

  Make a printable monthly shift or duty roster. Auto-assigns fairly, honors days off and a max streak, and exports CSV.

• Week Number Calculator

  Find the ISO week number, ISO year, weekday, day of year and quarter for any date, or look up a week's Monday-to-Sunday dates.