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Overview

Stopwatch is a time tool that Stopwatch timer: support start pause reset and laps with milliseconds and history for sports and lab timing, with one-click copy, offline and multilingual. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

• Exact age and total days
• Birthday and lunar reminders
• Timezone and timestamp conversion
• Date diff and workdays
• Use it to cross-check “秒表、stopwatch” in reports, docs or APIs to avoid manual conversion errors

How to use

1. 1 Pick start and end dates
2. 2 Toggle inclusive and workdays
3. 3 View weeks/months/hours breakdown
4. 4 Copy or add to calendar

Highlights

• Local & private: processing stays in your browser
• Live validation with tolerant parsing
• One-click copy and export for docs, code or sheets
• Batch and offline support under poor network

Notes

• Feb 29 birthdays vary by locale
• Seconds vs milliseconds timestamps
• Workdays need holiday data

FAQ