Difference between two dates

[Peter58]

Hi all... I'm looking for a simply way, to calculate the diff. between two 
dates ... in Days ! For example>

import times

let auj = format(now(), "d/MM/yyyy -- HH:mm") # Today's date... let deb = 
parse("04-09-2019", "dd-MM-yyyy") #an 'older' date... echo 
deb.format("dd-MM-yyyy")

Actually, the result will be : 54

Very thanks.