SAP BI DATE FORMAT

Hello Experts,

I have made a flat file extractor .  Flat file is coming from Another third part database.

Date format in flat file is in form DD/MM/YYYY  .  but in BI we do not have date dormat DD/MM/YYYY.

My Question is how we can add this date format in BI.

I cannot change the flat file date format because this file comes daily and placed in AL11 automatically.

its also very difficult first downlaod file from AL11 change the datw format in another form  then load the file.

dates Format in SAP BI are available.

Thanks,

Mohit.