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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In addition to the other excellent explanations, it might interest you to know that computers like desktops and smartphones regularly update their internal clocks to stay in sync, ultimately getting their updates from some very very expensive and precise mechanisms run by major governments. If that update mechanism stops working it causes problems for the computers when they try to securely communicate with each other after their clocks drift out of sync
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