Chip Pearson has some code that may help you:
http://cpearson.com/excel/DateTimeEntry.htm

If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm

Hoddros wrote:

I am trying to set up a timetable spreadsheet that will allow users to enter
the time as 4 digits and then Excel converts this automatically to the
correct time: for example 1630 would be 16:30. It would make the data entry
so much quicker than having to enter the colon every time. Can this be done
please?

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Dave Peterson