how to change the accept's time when i import a mail into outlook?

[StupidDog]

i can import a mail into outlook, but i can not change the accept's time of
the mail when i import the mail into outlook. the mail is imported have the
current time---import it into outlook
my code like.....

_MailItemPtr pNewMail;
pNewMail=m_pItems->Add();
pNewMail->To="someone";
pNewMail->CC="someone";
pNewMail->Subject="subject";
pNewMail->Body="body";

pNewMail->UnRead = FALSE;
pNewMail->Save();
NewMail->Move(m_pFolder);

how to change the accept's time of the mail when i import the mail into
outlook?
please help me about the problem!
thank you!