Date comparison

I have two date values.

These are stored in two variables.

bookingDate
dateToday

bookingDate has a value of 06/04/2023
dateToday is set with the below script:
[[ Now.toLocaleDateString(“en-GB”) ]]

This is set, to something like 04/11/2022

On load of a text field, I do the below calculation, to set its text but it just returns NaN.

[[ Date.parse(bookingDate)/86400000 - Date.parse(dateToday)/86400000 + 1]]

I want it to return the difference of days, between the dates. I’ll also want to do something similar to show hours and minutes.