Hello Kasim,
If you want to store in a single date field 2 different date format, you simply cannot. Per field is only 1 date format allowed.
BUT... by being a little creative :-D there is a way around it!!
At my knowledge, there are several methods:
1) You create a script to change the date in the document itself before loading it.
2) You write a user exit in arsload, in order to change "on-the-fly" the date format used in the document while doing the process to archive the document.
3) you use 2 applications, one for the format 1, and the second for the format 2.
Maybe others have some ideas... but these are the 3 that comes in my mind in 2 seconds !!
Sincerely yours,
Alessandro