Timezone Converter
Real-time display of major city times worldwide, with bidirectional Unix timestamp-to-date conversion. Toggle between seconds and milliseconds.
World City Clocks
Current Unix Timestamp
Auto-updating every second. Click to copy.
Date to Unix Timestamp
Pick a date and time in your local timezone
Result
Unix Timestamp to Date
Enter a 10-digit (seconds) or 13-digit (milliseconds) timestamp
Please enter a valid Unix timestamp (10 or 13 digits)
Result
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp (also known as Epoch time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC, not counting leap seconds. It is widely used in programming, databases, and APIs for portable time storage.
Seconds vs milliseconds — which should I use?
Most programming languages and databases use seconds (10-digit). JavaScript's Date.now() returns milliseconds (13-digit). This tool supports both — use the toggle to switch. When inputting a timestamp, we auto-detect 10 vs 13 digits.
How accurate are the world clocks?
The city clocks run entirely in your browser using the IANA timezone database. They update every second and automatically handle Daylight Saving Time (DST) transitions. Accuracy depends on your device's system clock.
Does this tool work offline?
Yes! All timezone calculations and conversions happen entirely in your browser using JavaScript. No server requests are made for the conversion logic, so the tool works offline after the page loads.