Setting Your Online Timer for 3 時間
This page makes it simple to set a countdown timer for 3 時間. The duration is pre-filled. Just click 'Start Timer' to begin. You can customize the sound and get alerts when time is up.
Getting Started: A Step-by-Step Guide for this 3 時間 timer.
- Set Duration: Input the desired hours, minutes, and seconds for your timer. For this page, it's preset to 3 時間.
- Name Your Timer (Optional): Click on the default name to give it a custom label like "Work Break" or "Cooking Time".
- Start and Pause: Click the green Start button to begin the countdown. The button will change to a yellow Pause button. Click it to halt the timer. Clicking Start again resumes it.
- After Zero: Once the timer reaches 00:00:00, a sound will play, and it will start counting *up*, showing "Time exceeded by...". You can pause and resume this upward count.
- Reset: Click its Reset button to return the timer to its initially set duration, ready to be started again. This works whether the timer is counting down, counting up, or paused.
高度な機能とユーティリティ
- Session Restore: If you close your browser, the timer's state (including running time and exceeded time) is saved. Upon your return, you'll be prompted to restore it. Time elapsed while the page was closed will be accounted for.
- ライト＆ダークモード: 太陽/月のアイコンを使ってテーマを切り替え、見やすくします。
- Fullscreen Mode: Click the fullscreen icon for a distraction-free view of your timer.
- サウンド切替: サウンドアイコン（🔊/🔇）を使ってタイマー完了時の通知音をミュートまたは解除します。
よくある質問（FAQ）
How accurate is the 3 時間 timer?
The timer uses your browser's internal clock and JavaScript's `Date.now()` for accuracy. Display updates frequently. While very precise for web-based applications, for critical life-dependent timing, dedicated hardware is always recommended.
ブラウザを閉じた場合はどうなりますか？
Your timer's set duration, name, and running state (including any exceeded time) are saved in your browser's local storage. When you reopen the page, you'll be asked if you want to restore it. If the timer was running, the time passed during closure will be accounted for.
タイマーデータはプライベートですか？
はい。すべてのタイマーデータはブラウザにローカルに保存され、サーバーには送信されません。