add() / subtract() Operation

Syntax	`set resultDateTime = aDateTime.add(aDuration);` `set resultDateTime = aDateTime.subtract(aDuration);`
Semantics	Add respectively subtract a duration to/from a DateTime object. This is calculated e.g. as follows: 31.01.2017 + 1 month = 31.02.2017 The resulting date 31.02.2017 is normalized to 03.03.2017. For a deeper understanding of how you can calculate with DateTime objects, refer to DateTime Arithmetics.
Substitutables	`aDuration`	Can be any variable or object attribute having the type Base Components.Basic Behavior.DateTime.DurationStructure.
Substitutables	`resultDateTime`	The resulting DateTime object.
Examples	CODE `create duration; set duration.years = 3; set duration.days = 10; set duration.minutes = 45; set newDateTime1 = aDateTime.add(duration); set newDateTime2 = aDateTime.subtract(duration);`

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