Help required in validating a pipe delimited file using shell script

Dear All,

I have a pipe delimited file which contains the header and then the data.

I have a requirement which needs that the value in the date columns hroughout the file be checked for a particular format as DDMMYYYY.

The problem i'm facing in is building up the logic as to how can i scan all the records in the file when i don't exactly know which column's can be the date column's.

Need your help urgently.

E.g.
Header: Amount|Date01|Date02|Curr|Date05
Sample Data: 260.00|12062012|12062012|INR|12062012

If you do not know which columns will include a date you wish to validate you are on a hiding to nothing from the start.
Assuming that you will know which columns should be dates you could do this in a few ways - using awk -F\| and having a validation function in the awk script (so you don't have to repeat code) would be a favourite.