How to view date in other format with Concatenation?

In my google sheet locale format is English. I enter all dates in format dd.mm.yy - its ok.

But when I write query with "select" dates and Concatenate with other data like (in output): "ClientName - DateOfBirdth", so i receive: 
"John Smith - mm/dd/yy". 
But I need:
"John Smith - dd.mm.yy"
Where can I it change? Or It is Concatenation rules?   
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