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			Function std.datetime.DateTime.opOpAssign
			        Gives the result of adding or subtracting a duration from this
        DateTime, as well as assigning the result to this DateTime.
        The legal types of arithmetic for DateTime using this operator are
DateTimedurationDateTimeDateTimedurationDateTimePrototype
ref DateTime opOpAssign(string op, D)( D duration ) pure nothrow @safe if ((op == "+" || op == "-") && (is(Unqual!D == Duration) || is(Unqual!D == TickDuration)));
Parameters
| Name | Description | 
|---|---|
| duration |  The duration to add to or subtract from this
                       DateTime. | 
Authors
Jonathan M Davis and Kato Shoichi