時間計算機
期間、年齢、日付の差などを含む包括的な時間計算ツール スイート。
エポックコンバーター
Unix タイムスタンプを人間が読める日付に変換します。
時間を加算/減算する
日付に時間を加算または減算します。
期間計算機
2 つの日付または時刻間の時間を計算します。
営業日
週末と祝日を除いた日付間の営業日数を計算します
年齢計算機
正確な年齢を年、月、日で計算します。
Cron式ビルダー
ビジュアルインターフェースでcron式を生成および検証する
Why Use Our Time Calculators?
Instant Results
All calculations happen in real-time as you type—no waiting or page reloads.
100% Accurate
Handles leap years, varying month lengths, and edge cases correctly.
Developer Ready
Copy results in ISO 8601, Unix timestamps, and other programming formats.
Timezone Aware
All tools respect your local timezone and handle DST correctly.
Frequently Asked Questions
Free Online Time Calculators for Every Need
Our collection of free time calculators helps you solve complex date and time problems instantly. Whether you're a developer working with Unix timestamps, a project manager calculating business days, or simply curious about your exact age, we have the right tool for you.
Calculator Overview
- Epoch Converter - Convert between Unix timestamps (seconds since 1970) and human-readable dates. Essential for developers and database work.
- Add/Subtract Time - Add or subtract years, months, days, hours, or minutes from any date. Perfect for deadline calculations.
- Duration Calculator - Find the exact time between two dates in multiple formats (days, hours, ISO 8601, etc.).
- Business Days Calculator - Calculate working days excluding weekends and optionally holidays. Great for project planning.
- Age Calculator - Calculate exact age in years, months, days, hours, and even seconds. Includes next birthday countdown.
- Cron Expression Builder - Generate and validate cron expressions with a visual interface. See upcoming run times.
Who Uses These Tools?
Our time calculators are used by software developers, project managers, HR professionals, event planners, students, and anyone who needs to work with dates and times. The tools are designed to be intuitive for beginners while providing advanced features for power users.