Sleep Calculator

Millisecond stopwatch with lap times.

Count the days until or since a target date.

Live countdown to a specific date and time.

Convert between Unix timestamps and dates both ways, with a live current timestamp.

Count business days (excluding weekends) between two dates.

Find the time difference and current time between two cities.

See the current time in major cities at once, live. Add your own cities.

Pomodoro timer that alternates focus and break sessions, with custom times and round counts.

HIIT interval timer that repeats work and rest periods over rounds.

Convert dates between the lunar (Dangi) and solar calendars, leap months included.

Count the days since you met and list milestone dates (100 days, 1 year, and more).

Calculate exact age in years, months, and days from a birth date.

Count elapsed time from a start moment — great for tracking quit-smoking or sober streaks.

Countdown with color warnings (yellow at 3 min, red at 1 min) — perfect for talks and exams.

A browser alarm that rings with sound at a set time. (Keep the tab open.)

A large digital clock you can show in fullscreen — great for study sessions and events.

Find your Chinese zodiac animal (Rat, Ox, Tiger…) from your birth year.

Find your Western star sign (Aries, Taurus…) from your birth date.