Formula do not work with Regional setting changes

Hi, 

I am exporting my data to Excel, and during export i am calculating Max - Min of Date. When my regional setting is set to English (En-us) from windows operating system it works well. but when is change Regional settings to Russian/ Italy formula gets failed and it it does not display appropriate values.

Formula which i am using is as follows(Just for example).

="Max = " &  TEXT(  MAX(B2:B3),"M/d/yyyy") 

Please let me what is the cause behind this? And how can i get rid of it?

Thanks,

C Mahone