Document TIMESTAMPADD, TIMESTAMPDIFF functions.
(Initial request was to add DATEADD as built-in scalar function, as follows. But it turns out that TIMESTAMPADD is similar enough.)
Syntax: DATEADD (datepart , number , date )
- datepart - Is the part of date to which an integer number is added.
- number - Is an expression that can be resolved to an int that is added to a datepart of date
- date - Is an expression that can be resolved to a time.
returns 2017-06-30 00:00:00.000