Calculate number of minutes until a future date/time

[CarlS]

I have this info from two group-adresses 3-byte time/day and three byte date
This is a date and time several days ahead for the start of a meeting
I want to calculate the number of minutes from "now" until the date/time in this two group-addresses, but I can't figure out how to do it...

Code:

Event for CUE Starttid (0/1/20) 29.03.2023 21:54:04
* arg: 1
  * string: startdate
* arg: 2
  * table:
   ["day"]
    * number: 2
   ["year"]
    * number: 2023
   ["month"]
    * number: 4
Event for CUE Starttid (0/1/20) 29.03.2023 21:54:04
* arg: 1
  * string: starttime
* arg: 2
  * table:
   ["day"]
    * number: 7
   ["minute"]
    * number: 0
   ["second"]
    * number: 0
   ["hour"]
    * number: 11
   ["min"]
    * number: 0
   ["sec"]
    * number: 0