Rules for date/time addition
If a date/time value is the operand of an addition, the other operand must be a duration.
The operands of date/time addition must be as shown in the following table:
|If one operand is a:||The other operand must be:|
|Date||A duration of years, months, or days|
|Time||A duration of hours, minutes, or seconds|
|Timestamp||Any valid duration|