On Thursday, June 20, 2019 at 12:57:28 PM UTC-4, Paolo Cravero wrote:
>
> Are you using some tricks to improve the reliability of "reading" AC line? 
> Either HW or SW. In Europe AC time is currently running 32 seconds late 
> since the beginning of the year. It will catch up, as it did in 2018 when 
> the grid had "lost" 300 seconds in 3 months. Every time I think my IN-14 
> clock has troubles with AC pulses, but in fact it's the grid running 
> noticeably fast or slow.
>

Apparently this was (is?) due to the former Yugoslav states:

https://www.reuters.com/article/serbia-kosovo-energy/serbia-kosovo-power-grid-row-delays-european-clocks-idUSL5N1QP2FF
(fair use excerpt): 
*"Serbia, Kosovo power grid row delays European clocks*

*SARAJEVO, March 7 (Reuters) - European power grid lobby ENTSO-E urged 
Serbia and Kosovo to urgently resolve a dispute over their power grid, 
which has affected the broader European network, causing some digital 
clocks on the continent to lose time."*

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