You can use several of the operators with dates and times as summarized here:

Operator	Type of Operation	Result
Plus	+ TimeSpan	TimeSpan
Negate	- TimeSpan	TimeSpan
Add	DateTime + TimeSpan	DateTime
Add	TimeSpan + DateTime	DateTime
Add	TimeSpan + TimeSpan	TimeSpan
Subtract	DateTime - DateTime	TimeSpan
Subtract	DateTime - TimeSpan	DateTime
Subtract	TimeSpan - TimeSpan	DateTime

The same order of precedence applies, including use of parentheses, as described in Order of Precedence.

If a DateTime or TimeSpan calculation results in an exception (for example, an OverflowException), the operator returns the #NUM! error.