Tools
Date and time tools
Tools for date calculation, day counts, age checks from a birth date, and Japanese era names.
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Japanese era
Japanese Year / Date Era Converter
Convert Gregorian years and dates into Japanese era notation from Meiji onward, including Reiwa, Heisei, Showa, and exact era transition dates.
Era table
Japanese Era Table
Check a year-by-year table of Gregorian years, Japanese era names, zodiac animals, and sexagenary cycle labels.
Age
Age Calculator
Calculate age from a birth date and reference date, including days since birth, the next birthday, and days remaining.
Days
Days Calculator
Calculate the number of days between two dates, including absolute and inclusive day counts.
Business Day Calc
Business Day Calculator (Excl. Weekends/Holidays)
Calculate an estimated date "N business days" in the future or past from a specific start date, excluding weekends and Japanese public holidays.