将所有日期时间列批量更新为 UTC 的最佳方法是什么

Question

I am looking for suggestion I have a few databases and deployed in Germany & UK Datacenters so all DateTime columns contain stores Datetime values according to their region.

Now my organization want to deploy Germany Database to UK Server to save licensing cost and I need to figure out the way that all applications keep on working as they are now.

The biggest issue is the DateTime columns, I need to find the optimum solution to change all DateTime columns data to UTC DateTime.

I believe my stored procedure will keep working fine as I am moving databases to UK region.

I need to update my C# code to display region specific date time when displaying data

Answer 1

Solution 1

You can use German locales on your British servers. If that's a problem with your app, then you can adjust the values in the app.

Solution 2

You can find all DateTime columns of all tables in your database

select schema_name(t.schema_id) + '.' + t.name as [table],
       c.column_id,
       c.name as column_name,
       type_name(user_type_id) as data_type,
       scale as second_scale
from sys.columns c
join sys.tables t
     on t.object_id = c.object_id
where type_name(user_type_id) in ('date', 'datetimeoffset', 
      'datetime2', 'smalldatetime', 'datetime', 'time')
order by [table],
         c.column_id;

(you can of course adjust the types if needed) and you can even generate a script for each column:

select 'update ' + schema_name(t.schema_id) + '.' + t.name + ' set ' + column_name + ' = dateadd(hour, -1, ' + column_name + ')'
from sys.columns c
join sys.tables t
     on t.object_id = c.object_id
where type_name(user_type_id) in ('date', 'datetimeoffset', 
      'datetime2', 'smalldatetime', 'datetime', 'time')
order by [table],
         c.column_id;

and then run the scripts generated this way. Note that this is untested, so you should test this very well before you apply this on your actual database.

Solution 3

Always subtract an hour from dates earlier than a given date. This is an admittedly messy solution and it should only be done if all else fails.