Unix Timestamp Converter
Convert Unix timestamps to ISO 8601, local time, and relative time — and back again.
100% in your browser — files never leave your device
Current time
1783880161
1783880161449
2026-07-12T18:16:01.449Z
From timestamp
From date
Timezone viewer
Shows the currently entered timestamp or date (or now if neither is set) in the selected timezone.
Frequently asked questions
Is any data sent to a server?
No. All conversions happen locally in your browser using the JavaScript Date API. Nothing is transmitted anywhere.
How does the tool tell seconds from milliseconds?
If the absolute value of the number is 1,000,000,000,000 (10^12) or greater it is treated as milliseconds; otherwise as Unix seconds. This threshold correctly covers all dates from 1970 to the year 33658.
What date string formats does "From date" accept?
Any format the browser's Date constructor can parse — most reliably ISO 8601 (e.g., 2024-06-15T12:00:00Z, 2024-06-15). Ambiguous locale formats like 06/15/2024 may parse inconsistently across browsers.