Have a look at TimeValue in help.

"Jack Bible" wrote in message
...
I am using "=TIME(HOUR(B11),MROUND(MINUTE(B11),I11),0)" for
a time card, but if a space is entered we get #VALUE error. How can
these spaces be filtered out. Input "06:00" or "06:00 am" works, but "
06:00" gives #VALUE error.

Thanks
Jack