For datetime and decimal types dbForge Studio has its own definitions. You should add a setting that will get the format from server and preferably it should synchronize changes for example if I execute SET lc_time_names = 'tr_TR'; it should change UI format accordingly.

But as a former developer and DBA admin (both mssql) I expected to see result of my query formatted in server and session parameters. For example if I set language to US English in Sql Server for my session all the datetimes in my results shown in US format both in Management Studio and my .Net application. In addition to this

Especially when i am working on application queries containing cast or convert function that converting datetimes to strings for a given parameter this behavior buys me quite some time just because I see the result on management studio and I know that this is what I will see in my application.