There are 2 parts in U1 4060. First part is the RC oscillator which generate a clock of 12.546875 sec. or 0.094814715Hz. Then the clock is further divided down by 2^13 (8192) to get 86400 seconds which is equal to the duration of one day.U1 clock period = 10.546875 sec, so after 8192 counts we have 86400 sec or 1 day.
24 hr*60 min*60 sec = 86400 seconds.
So what is coming out of 4060 at Q14 is actually one day. So that makes the task of 4017 decade counter easier. What comes out from Q1, Q2, Q3 & Q4 are 1 day-pulse, 2 day-pulse, 3 day-pulse, and 4 day-pulse.
Allen