Inserting a Running Clock Cell

Is it possible to insert a running clock into an excel sheet (ie so I can watch the time pass by in a cell) ideally in the form "mm:ss.0"?
I've tried googling it and haven't managed to get any of the stuff that pops up to work.
As it stands I want my sheet to run a timer in cell M2 starting from 00:00.0 with 3 on screen command buttons to control it (start, stop and reset), so if something happens I can stop the clock at the relevant time, and start it again from where it left off as required, then reset can put it back to zero when I want to.

Thanks

It can go back to zero, although it isn't intended to go beyond 20 minutes in normal service. Its not critical so any successful method of the bits I mentioned would be good.

Generally the inputs will all be done while the clock is stopped (ie something happens, so I stop the clock and write it down, then start the clock again). If no calculations can be done while the clock is running thats fine.

Leith, that would be fantastic, cheers.

Romperstomper, thanks for the link, have read through it but it seems a bit above my level, and the workbook example seemed to have disappeared (is a couple of years old so not a massive surprise).

Thanks, looks perfect when its running in your sheet. One thing I can't do is make it work in my sheet, probably just down to a complete lack of knowledge on my part. Few questions that may help:
1) If I copy the macro to "Sheet1" and delete the "Worksheets("Sheet1")." bit it doesn't work, is there an easy way around this so the macro works if I duplicate / change the name of Sheet1?
2) What are the names of the buttons? For some reason I can't get the properties window to open on your sheet, so I'm not sure what to tweak to fit into my sheet. Are they the names of the subs, and if so why isn't it followed by "_click"?
3) Where does the assign macro function you use on the buttons come from? I'm using Excel 2003 and it doesn't seem to offer me that option?

Its pretty late over here and I'm getting tired, which might be why I can't sort it, but thanks for the program as it at least gives me something concrete to work from.
Cheers

Ok, thats probably it then, I had made it with the control toolbox buttons not forms buttons, so there was no assign macro option.
Will play with it tomorrow morning
Cheers