時間ツール。あなたのブラウザで。
Countdown Timer
Set a timer for any duration. Get an alert when time is up.
Stopwatch
Precise stopwatch with lap tracking and millisecond accuracy.
Timezone Converter
Convert times between any IANA timezones with DST awareness.
Pomodoro Timer
Work in focused intervals with automatic break scheduling.
World Clock
Track the current time in multiple cities at a glance.
Unix Timestamp Converter
Convert Unix epoch timestamps to dates and back, in seconds or milliseconds.
Age Calculator
Calculate exact age in years, months, days, hours, and seconds.
Date Calculator
Add or subtract from a date, or measure the duration between two dates.
Interval Timer (HIIT)
Run work/rest intervals for HIIT, Tabata, and circuit workouts.
Alarm Clock
Set multiple alarms with labels, audio, and desktop notifications.
Meeting Planner
Find the best meeting time across timezones on a 24-hour overlap grid.
Sunrise & Sunset
Calculate sunrise, sunset, twilight, and golden hour for any location.
Chess Clock
Two-player chess clock with Fischer increment and Bronstein delay.
すべてのツールはブラウザ内で動作 — 入力した内容が送信されることはありません。