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Thanks so much for asking about this! The microwave is able to remember the Wi-Fi network information because this information does not change, and is physically recorded in the microwave's memory. However, the time is constantly changing, and the microwave would need a power source to be able to keep track of the time. Many models do have a small battery feature to help during a short power outage, but most of these will still lose time after a few minutes without a power source. Additionally, ensuring the microwave has it's own dedicated circuit with a minimum of 60Hz of consistent power will help prevent time loss.