SMTP PostMessage Date-What's the format of Date

I've been using the NMSMTP component.  It works great.  I just can
figure out how to format the string for the Date property of the
PostMessage object.  I've tried the obvious DateToStr(now) method, but
when I look at the sent date field in Micrsoft-Outlook, its blank.  I
know it wants a certain format date, probably something julian, but
what?  Help?

Greg Dillon