Gives the result of adding or subtracting a core.time.Duration from this Date, as well as assigning the result to this Date.
The legal types of arithmetic for Date using this operator are
The core.time.Duration to add to or subtract from this Date.
See Implementation
Gives the result of adding or subtracting a core.time.Duration from this Date, as well as assigning the result to this Date.
The legal types of arithmetic for Date using this operator are