Clock in KayOS

When I opened KayOS I saw clock files. Can you Explain what is it and maybe do a short text explanation about what which line does.

well it just reads the data from the system clock on the mainboard
it does that on timer interrupts.
and for a while I had it print the time to the screen, so I had a textmode-clock. But it conflicted with the textmode mouse pointer...
if I moved the mouse pointer over it and waited, it would overwrite the mousepointer in the next iteration (so it was "gone") and since the mousepointer always inverted the current color, moving it away then made the digit black-on-white until the next iteration

Thanks.
When I ran KayOS I didn't see clock anywhere so I thought It was 16-bit mode only or something like that and that it didn't work.