This would mean roughly +6 s/year, which is close to the best achieved performance of a quartz watch: Citizen CTQ57-0953 Chronomaster ( ) which stands at +/-5s/year. This is not an improvement! It would then be nice if the RTC could adjust automatically from -3.5 s to +0.5 s after each month. Since the minimum step of quartz correction is 0.5s/day, this means, the other option is +4s/month. After following the RTC in its original version, for several months, it proven to have -3.5s/month. This version makes what any user is supposed to do: at least a monthly adjustment of the watch, to less than 1s error. The basic version optimizes the performance of an existing quartz frequency, based on the Offset register of the PCF8523 Real Time Clock (RTC). ![]() ![]() This version increases the accuracy to better than 1s/month.
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