Date & Time

Age Calculator

Calculate age with Korean, Vietnamese, Japanese counting age systems

Military Discharge Date Calculator

Calculate Korean military discharge date for Army, Navy, Air Force, Marines, and Social Service

Lunar-Solar Calendar Converter

Convert between Korean/Chinese lunar calendar and solar (Gregorian) calendar with zodiac and sexagenary cycle

Japanese Era Converter (和暦西暦変換)

Convert between Japanese era years (Meiji, Taishō, Shōwa, Heisei, Reiwa) and Western calendar

Yakudoshi Checker (厄年チェック)

Check Japanese yakudoshi (unlucky years) with pre-calamity, main calamity, and post-calamity years

Days Between Dates

Calculate the number of days, weeks, and months between two dates

Date Add/Subtract Calculator

Add or subtract days, weeks, months, or years from any date

Week Number Calculator

Find the ISO week number for any date and view the full year calendar