Customizing Time Stamp In Receiver File Adapter

Hi,

I am working in a XI to file adapter scenario.

The default time stamp in receiver file adapter is yyyyMMdd-HHmmss-SSS.

I want to time stamp as "ABC_MM_DD_YYYY_HH_MM_SS".

i searched SDN,but not getting an end to end approach.

Like...I developed a UDF ,but when I map it to receiver root node..I am getting error.

Please help.

Just request for a step by step procedure.

Also,ASMA is not v clear to me......

Plzzzzzzzzzzzz help!!

Regards.