This should do it:

UPDATE Bookings
Booking_Start_Date = CONCAT(DATE_FORMAT(Booking_Start_Date, 
'%Y-%m-%d'), '09:00:00'),
Booking_End_Date = CONCAT(DATE_FORMAT(Booking_End_Date, '%Y-%m-%d'), 

If you are using version 4.1.1 or newer the DATE_FORMAT function could 
be replaced by:

On Fri, 3 Oct 2003 22:54:49 +0100, Shaun spoke thusly about [PHP-DB] 
HELP With UPDATE Query in mySQL:
> Hi,
> I have two columns in my Bookings table of type DATETIME -
> Booking_Start_Date and Boking_End_Date. How can i update every row so that
> all of the times for Booking_Start_Date are 09.00 and all of the times for
> Booking_End_Date are 17.30, without affecting any of the dates?
> Thanks for your help

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Jeff Shapiro

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