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digital clock logic gates and ic design

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i think you would hve to make a astable using inverter (or nand gates made into inverters) to make a second pulse then a bcd counter/decoder to show this, then a logic gate system or another astable to to work a seconds counter/decoder.
 
The usual way is to use a 32.768kHz crystal. This frequency is convenient because it's 2^15Hz so you can divide it down to 1Hz with a 15 bit counter.

Other than that you just need some counters for seconds Hours Days and some BDC and 7 segment decoders.
 
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