Import recurrent event problem

I have export my own created recurrent event from my asp.net application in
..ics format by writing the following code:

BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:Astana, Dhaka
BEGIN:STANDARD
DTSTART:16010101T000000
TZOFFSETFROM:+0600
TZOFFSETTO:+0600
TZNAME:Standard Time
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;VALUE=DATE:20070821
DTEND;VALUE=DATE:20070821
RRULE:FREQ=DAILY;UNTIL=20070823T000000Z;INTERVAL=1;WKST=SU
TRANSP:TRANSPARENT
SEQUENCE:0
UID:040000008200E00074C5B7101A82E00800000000E014082F76E9C7010000000000000000100
00000CB35540763821C4D840797C6AE9FE45B
DTSTAMP:20070821T080000Z
DESCRIPTION:test
SUMMARY:RecTest-2
PRIORITY:5
X-MICROSOFT-CDO-IMPORTANCE:1
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR

So the file save like MyRecurrentEvent.ics But when i try to import it in
my outlook calendar then it imported nicely but the starttime and endtime of
the recurrent event always shows 12.00 AM. So how can i solve this problem ?