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https://www.mssqltips.com/sqlservertip/2509/add-and-subtract-dates-using-dateadd-in-sql-server/#:~:text=How%20to%20use%20the%20DATEADD%20%28%29%20Function%20and,chart%20to%20get%20a%20list%20of%20all%20options
https://sqlhints.com/tag/how-to-add-hours-to-datetime-in-sql-server/
Below example shows how we can add two hours to Current DateTime in Sql Server: SELECT GETDATE() 'Now', DATEADD(hour,2,GETDATE()) 'Now + 2 Hours' SELECT GETDATE() 'Now', DATEADD(hh,2,GETDATE()) 'Now + 2 Hours' RESULT: [ALSO READ] How to get difference between two dates in Years, Months and days . How to add Minutes to DateTime in Sql Server? We can …
https://stackoverflow.com/questions/8020744/sql-add-datetime-add-hour-add-minute
From what I understand, you want to add the first two digits as hour, the second two as minute - but you're not doing this in your DATEADD calls - you're adding both parts as HOUR - try this instead: SELECT DATE_DEBUT, HEURE_DEBUT, DATEADD(MINUTE, CONVERT(int, SUBSTRING(HEURE_DEBUT, 3, 2)), DATEADD(HOUR, CONVERT(int, …
https://www.w3schools.com/sqL/func_sqlserver_dateadd.asp
hour, hh = hour; minute, mi, n = Minute; second, ss, s = Second; millisecond, ms = Millisecond; number: Required. The number of interval to add to date. Can be positive (to get dates in the future) or negative (to get dates in the past) …
https://docs.microsoft.com/en-us/sql/t-sql/functions/date-and-time-data-types-and-functions-transact-sql
SQL Server 2019 (15.x) derives the date and time values through use of the GetSystemTimeAsFileTime () Windows API. The accuracy depends on the computer hardware and version of Windows on which the instance of SQL Server running. This API has a precision fixed at 100 nanoseconds.
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.mssqltips.com/sqlservertip/2509/add-and-subtract-dates-using-dateadd-in-sql-server/
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; Date Formats and Units of Time. A thing to note is that the date format can be any date format that SQL Server recognizes such as: 9/1/2011 ; 9/1/2011 12:30 ; 9/1/2011 12:30:999 ; 2011-09-01
https://blog.sqlauthority.com/2015/10/30/sql-server-adding-datetime-and-time-values-using-variables/
SQL SERVER – Adding Datetime and Time Values Using Variables. Datetime datatype stores date and time part. If you have only date value, You can add time part to a datetime variable using direct literal value and + operator. The data types datetime and time are incompatible in the add operator.
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