Failing in fetching data from web api

I am using exactly this tutorial and an answer from bymaho.
The exact url is this:

https://www.convertunits.com/dates/from/

These are the dates from date pickers in thunkable Feb+23,+2023/to/Feb+25,+2023 that I pass to url but thunkable doesn’t give months in “jan” or “feb” format that’s why I am using this logic. And from here I want to pick only the difference of two dates. please have a look at this screenshot to understand it fully.