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https://stackoverflow.com/questions/12756769/sql-convert-datetime-and-subtract-hours
The query above that uses dateadd will always subtract 4 hours. If your goal is to convert an arbitrary datetime from UTC to local time, then it's more complicated because the offset that you need to add/subtract depends on the original datetime. A single value like -4 won't always work. Here are some ideas for dealing with the general case:
https://www.raiseupwa.com/lifehacks/how-do-i-subtract-hours-and-minutes-in-sql/
How do I subtract hours and minutes in SQL? Using DATEADD Function and Examples. 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 …
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
https://social.msdn.microsoft.com/Forums/en-US/97eb2336-8f1f-4749-a8e1-a80e2de1eefc/how-to-subtract-time-from-time-in-sql
User1912965948 posted Hi all, I want to get a total working hour per day, SQL Table Emp_Name Emp_No Date ClockIn ClockOut Tom Hardy 1 2018-10-01 2018-10-01 08:41:20 2018-10-01 18:56:19 Tom Hardy 1 2018-10-02 2018-10-02 08:38:40 2018-10-02 21:34:23 T · User-821857111 posted SELECT FORMAT(DATEADD(ss,DATEDIFF(ss,[ClockIn], [ClockOut] ),0),'hh:mm ...
https://www.tutorialsrack.com/articles/393/how-to-add-and-subtract-dates-from-datetime-using-dateadd-function-in-sql-server
In this article, you will learn how to add and subtract years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds from DateTime in the SQL server. DateTime manipulation is the most common scenario is when we fetching data from the database or storing data in a database. Here, in this article, we will use the SQL server built-in DATEADD() function …
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/a3928517-b9ac-4af8-a48e-2d60ff648f0a/subtracting-hours-from-datetime
The part where it isn't working uses two variable @TimeDif which declared as an INT value at the top and @Date which is declared as a DATETIME value at the top. 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 ...
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