Time & date
Online timers, stopwatches, countdowns and date calculators that stay accurate in background tabs.
15 tools
Age CalculatorYour exact age, Korean age conventions, zodiac animal and star sign — all from one date of birth.Alarm ClockSet several labeled alarms in one clean tab and keep them saved on this device.CountdownSet a moment, watch it update every second, and share the exact event in one privacy-friendly link.Date CalculatorCompare two dates or shift one by a calendar or business-day amount, with US and Korean public holidays built in.Hours CalculatorAdd a week of shifts, deduct unpaid breaks, and get accurate hours and decimals immediately.Interval TimerStart a workout preset in one click, or set your own work, rest and rounds — with optional voice cues.Korean Lunar ConverterConvert both ways and see leap-month status, ganji, zodiac, and the 2026–2027 solar dates for the same lunar birthday.MetronomeSet a steady click in seconds with tap tempo, a clear first-beat accent and browser-saved settings.Online ClockA large local-time display with clear settings, a copy button and one-key full screen.Pomodoro TimerFocus on one selected task, keep a local session record, and get optional alerts without signing in.StopwatchMeasure elapsed time to milliseconds, keep every lap after refresh, and download the record as CSV.Time Zone ConverterSearch cities, choose the date, and see the exact local time—including DST and the date change.TimerA big, clear countdown with an alarm — survives a page refresh.Unix Timestamp ConverterPaste a Unix timestamp or choose a date; convert both ways with automatic seconds/milliseconds checks and explicit UTC or device time.World ClockKeep selected cities in view and see the whole-hour window when everyone is within local working hours.