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Why does my home phone continually revert back to ordinary time when I set it to daylight saving time?
Welcome to the Community!
Did you set the DST on the 'Time settings' of your modem/router?
If not, please access the modem/router interface, then go to 'Advanced tab' > 'System tools' > 'Time settings'.
You may check this article that will guide you on how to access the modem/router interface.
Let us know how it goes.