Hi @Markus_Danninger You can for sure do this using the available minDate and maxDate options of the datepicker() function. There are a few ways to define a date in this context. Personally I find the easiest and most readable way as something like this:
The “+1w” and “+2w” are one week and two weeks from the current date. So the above would set a date range of one week, starting a week from today. You can also hard set a date using the date format specified in the function. For example:
new Date(2018, 1 - 1, 1)
You can find a bit more info in the jQuery UI docs here http://api.jqueryui.com/datepicker/#option-maxDate
Hope this helps!