JWT Claim Time Converter

Work with exp, iat, and nbf timestamp values locally using Unix-epoch seconds.

NumericDate seconds

ISO / date-time

JWT NumericDate converterNumericDate is seconds from the Unix epoch; fractional seconds are preserved when supplied.

JWT contents are untrusted until signature verification and application-specific claim validation succeed. These browser-local tools do not contact an issuer, fetch keys, or validate authorization policy.

How to use this JWT Claim Time Converter

Convert JWT NumericDate seconds to ISO/UTC time and ISO timestamps back to NumericDate seconds. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.