time comparison

Summary:

How can I compare two times in an OIC 3 flow.

Content (please ensure you mask any confidential information):

I want to receive an access token, make a variable with it's expiry time (1 hour ) and set up a switch to enter into if the time is expired.
I was trying something like this, based off how you would compare a date to another.

ns0:time($token_expiry) <= fn:current-time()
token_expiry is a string

Version (include the version you are using, if applicable):

Oracle Integration Cloud v3.

Code Snippet (add any code snippets that support your topic, if applicable):

ns0:time($token_expiry) <= fn:current-time()