jwt debugger exp time/date display is incorrect

[bpringe]

The hover tooltip shows a date that is about a month behind what it should be, unless I am missing something. When I enter that time into https://www.epochconverter.com/ it shows Thursday, May 7, 2020 6:22:10.874 PM GMT-07:00 DST.

[Spomky]

A month behind? What about the year 52320?
It looks like the error comes from the value itself.
Is it in milliseconds?

[Sambego]

Hey @bpringe, looks like the value of your exp claim is in milliseconds instead of seconds. The JWT specification specifies NumericDate values as:

A JSON numeric value representing the number of seconds from
1970-01-01T00:00:00Z UTC until the specified UTC date/time,
ignoring leap seconds

More info: https://tools.ietf.org/html/rfc7519#section-2

[bpringe]

Wow... definitely missed the year 😄. I should have at least looked at the spec before creating this issue, sorry! Thanks for the quick response and the info.

[DanOnCall]

This looks to be a common issue to happen. I'm reopening this issue to add a hint on the next version of jwt.io to help people troubleshoot this quickly :)