Remove minutes from datetime - sql

问题

DECLARE @MinutesToAdd int = 20; 
DECLARE @StartTimeDate datetime = '2017-06-05 14:37:56.113';  
DATEADD(minute,@MinutesToAdd,@StartTimeDate);

Code above adds 20 minutes to StartTimeDate. Is there a good way to remove those 20 minutes not add? Tried to find a solution, but didn't catch one. Any ideas?

回答1:

You don't have any specific function to subtract any dateparts

Just add negative symbol in front

Select DATEADD(minute,-@MinutesToAdd,@StartTimeDate);

or multiply with -1

Select DATEADD(minute,@MinutesToAdd * -1 ,@StartTimeDate);

回答2:

Try this:

 DECLARE @MinutesToAdd int = -20; 
    DECLARE @StartTimeDate datetime = '2017-06-05 14:37:56.113';  
    select DATEADD(minute,@MinutesToAdd,@StartTimeDate);

来源：https://stackoverflow.com/questions/44582802/remove-minutes-from-datetime-sql