Measure elapsed time with millisecond precision. Start, stop, and reset for accurate time tracking of any duration.
Stopwatch
00:00:00.000
How it works
Uses requestAnimationFrame for smooth, accurate timing. Lap times show split from start and total elapsed time. Millisecond precision for accurate measurements.
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What this tool offers
Instant Results
See conversions as you type
Copy to Clipboard
One-click copy for easy pasting
Timezone Support
Work with any timezone worldwide
Live Clock
Real-time clock display in toolbar
Responsive
Works on desktop, tablet, and mobile
Dark Mode
Easy on the eyes for long sessions
Private & Secure
All processing happens locally
No Registration
Free to use, no sign-up required
Methodology and approach
The stopwatch tracks elapsed time by accumulating millisecond intervals between start and stop events.
This tool helps developers and engineers convert between date formats, calculate time differences, and work with timestamps efficiently. Instead of writing conversion code or looking up format specifications, you can get instant, accurate results.
Use this tool whenever you need to convert timestamps for APIs, debug date-related issues, calculate durations, or format dates for display. It is especially useful when working with databases, REST APIs, or scheduling systems.
Our tools follow international date and time standards including ISO 8601, RFC 3339, and RFC 822. Timezone conversions use the IANA timezone database for accurate results across all regions.
Common questions about this tool
