Can I say,<br/><br/>(a) They party will be held<u> from 5 (o'clock)to 8 o'clock on 28 July 2009.</u><br/><br/>(b) They party will be held<u> from 5 p.m. to 8 o'clock. </u><br/><br/>(c) They party will be<u> held from 5 o'clock on 28 July 2009.</u>