regarding fm-hr_infotype_operation

HI EXPERTS,

i m developing report for uploading infotype 0008 from excel sheet,here in the excel sheet

i m giving begda & endda as 01042008 31032009 & i m using fm-hr_infotype_operation

but here it is giving this error:E00 064Invalid date ,enter the date

in the format __.__.____.

plz helpe to sort out this problem.