Can someone explain why it starts at 01:00? Instead of 00:00

 

Your P0 pin is set to High on the second digit chip U2.

 

Your P0 pin is set to High on the second digit chip U2.

thanks, but if i set it to low, it won't jump from 12:00 to 01:00, instead it would just go to 00:00

 

If this is a 12 hour clock then 00:00 would be an invalid time.

 

If this is a 12 hour clock then 00:00 would be an invalid time.

yeah you're right