weird - I cannot replicate this - even if the 1 I enter is text, it still forces the textual time cells to be re-evaluated as numbers. If you post your email address, I'll send you an email which you can reply to with the workbook - as long as you are not using a version > '97.
If you are, save the workbook as '97 version and send that instead
Rgds
Geoff
"Some cause happiness wherever they go; others whenever they go."
-Oscar Wilde