How to interpret JWT token or Access token expiry in date time ?

 Use Online tool such as https://jwt.io/ which allows you to decode, verify and generate JWT.

You will find the decoded value in payload data section.

Copy the values of iat (issued at) or exp (expiry) and use the below link to convert the time 

https://koopar-tools.w3spaces.com/index.html

e.g: in the above example Token expiry is 1623945123 => Thu Jun 17 2021 21:22:03 GMT+0530 (India Standard Time)