crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2918746:0crwdne2918746:0

crwdns2944351:0crwdnd2944351:0Grayson Automatic Flip Calendar Clock w/ Faulty Datecrwdnd2944351:0crwdne2944351:0

crwdns2933797:0Dave Empsoncrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Dave Empson

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Introduction
My 12 year old battery-driven automatic Grayson flip calendar clock often has the wrong date showing ie it shows 31 days in months with only 30 days and doesn't recognise leap years even though it should dois suppose to.
This guide shows how simple maintenance can cure this problem which I could not find on the internet (in 2022).
The flip calendar (day, date and month) is primarily driven mechanically by the battery-driven clock every day. But at the end of a 30-day month an electric motor, driven by the same battery in the clock, moves the date through 2 days instead of 1 day. This happens due to rotating contacts aligning on a printed circuit board (pcb) adjacent to the 'months' wheel.
Similarly at the end of February it moves on 4 days or 3 days if it is a leap year. So there is a similar pcb with contacts adjacent to the 'leap year' wheel.
After about 10 years of use, dirt can accumulate between the contacts and the copper tracks on both the pcb's . This can be simply cleaned off with 'switch contact cleaner' without having to dismantle anything.
If you don't have any contact cleaner you could try dismantling the units and manually cleaning the contacts and adding a little lubricant, but that sounds like hard work.