Excel: Converting Time Entered as a Number to a Valid TimeID: Q78933 
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The formula shown below converts time entered, without the colon (:) (for example, 121010 instead of 12:10:10), to a valid serial number so that time calculations can be performed or number formatting applied.
   The value, 0.410543981, which is a valid serial number, should
   result in  cell A2. "Microsoft Excel Function Reference," version 3.0, pages 137-138, 151-152, 200, 243
Additional query words: 2.10 2.1 2.10c 2.1c 2.10d 2.1d 2.20 2.2 2.21 4.0 4.00a
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Last Reviewed: March 23, 1999