How to use/create a real time clock to use with specialized?
CD4060 IC binary counter + Osc  follow Xtal Osc design
Use Q15 = divide by 2^15= 32,768 = 1 Hz 

Xtal 32,768 kHz   + discrete RC parts  or MEMS OSC XO 32.7680KHZ CMOS SMD
more  CD4060/4040's and gates to reset after output = 86,400 s
1 0101 0001 1000 0000 = 86,400

3V or 3.6V Li Ion