If you are looking at simpledateformat you are looking in the wrong place. A DateTime represents an instant in time, not a duration.
There is no built in function to format a duration. You need to write a rule or JavaScript transform to convert a Number of minutes or seconds to the String format you are after.
well it basically works with dates as it counts today + n and then differs (which i can handle) What I’m really looking for is how to convert hours into
today + hours = datetime (eq. equivalent of strtotime)
and then I’ll move on with a rule