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Help with Passing Event Start/End Date/Time to Custom Object Using Custom Button

I have a custom button we use to pass data from Events to a "Registrations" custom object.  It works great.  We want to add passing the Event Start Date/Time and End Date/Time but it seems to pass only the Date, not the time.  Any Ideas or insight you can add would be appreciated.  The applicable code:
Code:
&00N50000001kKSt={!Event.StartDateTime}
&00N50000001kKSy={!Event.EndDateTime}

 Where 00N50000001kKSt is a Registration custom field (Date/Time) called Start and
00N50000001kKSy is a Registration custom field (Date/Time) called End.
 
Only the Date is displayed in Start and End and the error message is :
Error: Invalid Date and Time

Appreciate any help with this.