Hi Jonas,
Your job is correct, I suggest you put a "No Op" component after to the update component and join these with a ok flow to finish the operation.
Now, if you want schedule the "job" in a certain date since a form, you have to use a "schedule job" in the ifml, for example you have the form and with a normal flow you have to join with the "schedule job" component, select this component go to the properties and in the "Job" properties select your job, and in "Schedule Policy" select "Specific Date" option, and in the normal flow (since Form to Schedule job) you have to send the date field to the parameter timestamp (if you field is timestamp type), if you have a field date type, you should use a time component send the date value and get the day, month, year, .... and send this data to the "schedule job" component