Problem concerning date using oo40

I am trying to get the results of my date queries in the following format :
'dd.mm.yyyy,hh:mi:ss'
As I parse the char* result, the format has to be this.

Could anyone tell me how to obtain a formatted result ?

I tried to set the NLS_LANG setting, and to use the to_char Oracle function, with no effect

Thanks in advance

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Alexandre CHRIQUI
bakka_at_omatis.com