Convert a Unix timestamp (epoch) to a human-readable date and back. Auto-detects seconds vs milliseconds. Everything runs in your browser.
A Unix timestamp counts the time since 1 January 1970 UTC. APIs use seconds (10 digits today, e.g. 1516239022) or milliseconds (13 digits, e.g. 1516239022000). This tool detects which you pasted and converts accordingly. JWT iat/exp claims are in seconds — decode a token with the JWT decoder.
Open the JSON viewer to explore a large payload, or the JSON to CSV converter to export it.