icalendar事件时区与用户时区的时间不匹配

I am sending event to MS outlook through mail, But Event time is different with what i have send.

I Also want to support icalender event for all Application like MS Outlook, Google Calendar ..etc

Any good resource or api for implement icalendar event then let me know. e.g

Sending :

Start Time : 12:40 P.M.
End Time   : 01:00 P.M.

At User end, Outlook shows event after 1 hour.

Start Time : 01:40 P.M.
End Time   : 02:00 P.M.

I want the same result which i am sending.

Below is my icalendar code.

$ical = 'BEGIN:VCALENDAR' . "
" .
        'PRODID:-//Microsoft Corporation//Outlook 10.0 MIMEDIR//EN' . "
" .
        'VERSION:2.0' . "
" .
        'METHOD:REQUEST' . "
" .
        'BEGIN:VTIMEZONE' . "
" .
        'TZID:'.date_default_timezone_get() . "
" .
        'BEGIN:STANDARD' . "
" .
        'DTSTART:20091101T020000' . "
" .
        'RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11' . "
" .
        'TZOFFSETFROM:-0400' . "
" .
        'TZOFFSETTO:-0500' . "
" .
        'TZNAME:EST' . "
" .
        'END:STANDARD' . "
" .
        'BEGIN:DAYLIGHT' . "
" .
        'DTSTART:20090301T020000' . "
" .
        'RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3' . "
" .
        'TZOFFSETFROM:-0500' . "
" .
        'TZOFFSETTO:-0400' . "
" .
        'TZNAME:EDST' . "
" .
        'END:DAYLIGHT' . "
" .
        'END:VTIMEZONE' . "
" .  
        'BEGIN:VEVENT' . "
" .
        'ORGANIZER;CN="'.$from_name.'":MAILTO:'.$from_address. "
" .
        'ATTENDEE;CN="'.$to_name.'";ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:'.$to_address. "
" .
        'LAST-MODIFIED:' . date("Ymd\TGis") . "
" .
        'UID:'.date("Ymd\TGis", strtotime($startTime)).rand()."@".$domain."
" .
        'DTSTAMP:'.date("Ymd\TGis"). "
" .
        'DTSTART;TZID="'.date_default_timezone_get().'":'.date("Ymd", strtotime($startTime))."T".date("His", strtotime($startTime)). "
" .
        'DTEND;TZID="'.date_default_timezone_get().'":'.date("Ymd", strtotime($endTime))."T".date("His", strtotime($endTime)). "
" .
        'TRANSP:OPAQUE'. "
" .
        'SEQUENCE:1'. "
" .
        'SUMMARY:' . $subject . "
" .
        'CLASS:PUBLIC'. "
" .
        'PRIORITY:5'. "
" .
        'BEGIN:VALARM' . "
" .
        'TRIGGER:-PT15M' . "
" .
        'ACTION:DISPLAY' . "
" .
        'DESCRIPTION:Reminder' . "
" .
        'END:VALARM' . "
" .
        'END:VEVENT'. "
" .
        'END:VCALENDAR'. "
";

What is in your TZID parameter needs to match what is in the TZID in the VTIMEZONE object.