時間ツール
年齢計算機
正確な年齢、経過日数、合計月数と次の誕生日までの期間を計算します。
ほとんどのツールはブラウザ内でローカル処理します。背景除去では選択した画像を設定済みサーバーで処理し、完了後に元画像を削除します。
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使い方
- Enter your birth date and check the calculation date. Use Today to restore the browser’s local date.
- Choose February 28 or March 1 for a February 29 birthday in non-leap years.
- Review your exact age, days lived and next birthday, then copy or print the results if needed.
おすすめの用途
- Checking an exact calendar age
- Counting days and months lived
- Planning an upcoming birthday
注意点
The age is a calendar calculation, not a medical or legal record. Hours lived are an approximation based on whole calendar days; all dates stay in your browser.
よくある質問
How old am I exactly?
Enter your birth date and calculation date to get a calendar difference in years, months and days. The result does not divide days by 365.
How many days have I been alive?
The calculator counts natural calendar days from the birth date up to the calculation date using a stable calendar-day boundary.
When is my next birthday?
The next birthday is the next occurrence of your birth month and day on or after the calculation date. February 29 birthdays use your selected February 28 or March 1 rule in non-leap years.
How are February 29 birthdays handled?
Leap years use February 29. In other years you can celebrate on February 28 or March 1.
Is my birth date uploaded or stored?
No. Calculations happen locally in your browser. Dates are not placed in the URL, saved for later or sent to analytics.