dsadd command-line tool works , but created account do not disable at secified expiration date

Hi everybody

i use dsadd command-line tool to add users to my AD with expiration date .

everything is ok and the specified user is created normally . but i use -acctexpires switch to account disable at specific date automatically . at the account tab of user , at active directory , date is set , and should be expired yesterday but , user is yet enable and normal !!!!!!! :(

please help me , what i should do ? it is too important for me !!!