Thanks - that’s a helpful summary and pointers. I’m sure I can find some diagrams, videos etc to learn a bit more as well - I had looked at my watch on Year’s Eve and noticed the date hadn’t changed just after midnight and then when I looked back a few minutes later, it had changed and I wondered when it did.
I happened to go to bed at midnight last night so made a point of watching it and was surprised how how different it was to other watches I own.
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