Components for designing a digital watch

Hi,


What goes into a digital watch?

I'm looking to design/program a watch with some special timing functions geared towards test-taking for students.



What kind of chip should I use?

Where can I outsource the design and programming of the chip?


Please help.



Thanks!



I didn't find the right solution from the Internet.



References:

forum.allaboutcircuits.com/threads/components-for-designing-a-digital-watch.117605/

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