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https://ycsoftware.net/add-and-subtract-hours-to-t-sql-datetime/
Add to 1 hour to the Current Date. DATEADD(hh,1,getdate()) Subtract 1 hour to the Current Date. DATEADD(hh,-1,getdate()) Add 1 hour to the Current Time and returns just the time part. select Convert(varchar,( DATEADD(hh,-1,getdate())),8) Reference http://msdn.microsoft.com/en-us/library/ms186819.aspx
https://stackoverflow.com/questions/12756769/sql-convert-datetime-and-subtract-hours
declare @createTime datetime = '2012-10-06 02:29:37.243'; -- original value, default formatting select @createTime; -- formatted select convert(varchar, @createTime, 100); -- subtract 4 hours, formatted select convert(varchar, dateadd(hour, -4, @createTime), 100); The query above that uses dateadd will always subtract 4 hours. If your goal is to convert an arbitrary datetime from UTC to local …
http://www.beansoftware.com/t-sql-faq/subtract-datetime-smalldatetime.aspx
How To Use T-SQL To Subtract Dates And Calculate Time Span? From time to time, you'll need to find out duration of some process, get age from birthday, find how many days till anniversary, etc. In cases like this, you need to subtract two dates and calculate difference (time span) between them. The simplest approach is to subtract times directly.
https://www.raiseupwa.com/lifehacks/how-do-i-subtract-hours-and-minutes-in-sql/
How do I subtract hours and minutes in SQL? Add 30 days to a date SELECT DATEADD (DD,30,@Date) Add 3 hours to a date SELECT DATEADD (HOUR,-3,@Date) Subtract 90 minutes from date SELECT DATEADD (MINUTE,-90,@Date) Check out the chart to get a list of all options.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/a3928517-b9ac-4af8-a48e-2d60ff648f0a/subtracting-hours-from-datetime
When I execute it as a stored procedure the part that is set off by the boolean flag to subtract hours adds them when I use the variable, but when I replace it with a regular integer value (lets say for example 12) it will subtract it. SELECT (DATEADD(hh, - @TimeDif, @Date)) AS …
https://docs.microsoft.com/en-us/sql/t-sql/data-types/datetime-transact-sql
DECLARE @time time(4) = '12:10:05.1237'; DECLARE @datetime datetime = @time; SELECT @datetime AS '@datetime', @time AS '@time'; --Result --@datetime @time ----- ----- --1900-01-01 12:10:05.123 12:10:05.1237 When the conversion is from smalldatetime, the hours and minutes are copied. The seconds and fractional seconds are set to 0.
https://learnsql.com/cookbook/how-to-calculate-the-difference-between-two-datetimes-in-t-sql/
To calculate the difference between the arrival and the departure in T-SQL, use the DATEDIFF (datepart, startdate, enddate) function. The datepart argument can be microsecond, second, minute, hour, day, week, month, quarter, or year. Here, you'd like to get the difference in seconds, so choose second. To get the difference in hours, choose hour; for the difference in months, choose month, etc.
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