Custom data types to mask fields

Hi collegues,

I am developing a web application that shows KPIs around dates, months, another time periods extracted from generated time data and fields that need custom visualization format.

Now we are facing some issues when we try to format those data types,

For example:

We have in our tables the field CALMONTH with the format YYYYMM.

And we want to format it like MM.YYYYfor the web application, like BW does.

We successfully formated regular dates because it is a DATE data type, but CALMONTH is NVARCHAR(6).

Is there a way to create custom data types to format certain fields? It would be very useful.

Or is there any workaround?

Thanks.

Iván Cernigoj