Any XSLT function to get the Last Day of a Month when the input parameter is sent as MON-YY?

Summary:

Any XSLT function to get the Last Day of a Month when the input parameter is sent as MON-YY? 

Content (required):

We have a requirement to get the Last Day of a Month using the Month & Year. We are receiving the Month and Year in MON-YY (example: May-22) format in the inbound file. Is there a way to fetch the last day (example: 2022-05-31) using any XSLT function, or the only way to do it would be using a JavaScript library?

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

OIC Gen 2

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