Domoticz

If possible I would like to have a timer that checks if a variable is a 0 or 1. That way I can program several timers for e.g. hollidays

e.g: a schoolholiday the var vacation is set to 1
not a schoolvacation the var vacation is set to 0

So can make timers that check the var and act accordingly....

Did you read the wiki?
If you define a user variable called "vacation", you can use that in a script / blockly. You can either directly call the uservariable in a script like so:
I always put the uservariables in local script variables, this makes the code more readable and easier to debug imho.

In a script you would first fill a script variable based on the user variable like:
vacation = uservariables["vacation"]

Then you can just do: