6 digit odometer or event counter

I need to know if anyone has built or knows how to build an odometer (with memory) for a car using a 6 digit LED common anode display based on a atmel 89c2051 I've looked for some examples and I don't have a very good understanding of ASM code to program a atmel or even a modify a similar circuit to do what I want.

I need to know if anyone has built or knows how to build an time totalizer 9999.99 4 digit hour and 2 digit minutes (with memory) a 6 digit LED common anode display based on a pic or atmel

No need for two threads.... Look at my timer article... Simple counter for 8051 using a gated input.
https://www.electro-tech-online.com/articles/simple-interrupts-on-the-8051.654/

If you look through these articles there is a lot of code..

Hi
please upload both schematic circuits
thanks