UNIX Time Converter
Convert UNIX timestamps (seconds or milliseconds) to UTC/local time and back.
The tool auto-detects whether the input is 10-digit seconds or 13-digit milliseconds
and updates all fields in real time with no API calls.
View ISO 8601 output, human-readable strings, and the detected weekday.
Quick actions let you copy any field, jump to the current time, auto-refresh every second, or clear inputs.
All calculations are done in your browser using the native Date and Intl APIs.
Auto-detects seconds or milliseconds
Auto-syncs with UNIX input. Accepts local time.
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