Hello Jordi,
The pickup at parameter is working the same way in v1 and v2 if you respect the ISO 8601 format.
You can refer to the How should I format dates? topic in the FAQ section for more information.
To set a job for 8:30 PM in Spain you must use the following format “2018-05-17T20:30:00+02:00” as Spain is currently 2 hours ahead of UTC.
The issues you are having are caused by the fact you are not providing any time zone information.
If no UTC relation information is given with a time representation it is ambiguous when used in communicating across different time zones. Even within a single geographic time zone, it will be ambiguous if the region observes daylight saving time (as Spain do). We recommend you to indicate a time zone (zone designator) using the standard’s notation to clear any ambiguity.