basic elapsed seconds counter

Hi,

I need to build a simple timer which simply counts elapsed time in
seconds as soon as current is turned on, then turns off and resets
when the power is disconnected. Or perhaps resets then begins counting
elapsed seconds, then shuts off when the power is disconnected. I
would like to display the seconds on an LCD or LED screen about the
size of a spoon.

I have no experience with electronics but I am keen to learn!
Hopefully this will be the start of many gadgets...

I really appreciate your help. Thanks!!!

-Ben
.

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