Had a power cut three months ago. Set my oven, my microwave and alarm clock to match the time on my phone. After setting them they would have all been within 1 minute of each other roughly.
Three months on, at the time of writing this, my phone reads 10:10, oven 9:56, microwave 10:02 and digital clock 10:11.
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They all run with their own “internal clock”, which on cheap models is a simple quartz.
Quartz, like any other component, has variations, which lead to this.
There are ways to sync stuff well, the first being to use better “quartz” with lower spread, and another to use a syncing signal which is what your phone does. A combination of both can result in syncing systems to the nanosecond (i designed and built this for my job).
But it costs money, so on cheap appliances that do not need to be that much accurate, you wont find them.
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