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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.
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://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 get a list of all options. What does Dateadd do in SQL?
https://stackoverflow.com/questions/32895736/subtract-hours-from-sql-server-2012-query-result
DATEADD() can also "add" a negative value, but it is still looking for the start date at the end of the syntax. My "start date" to subtract from is already part of the query results. It's that date that I want to adjust -4 hours. –
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