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A comment on You Can't Trust Network Time. Parent comment

Re:You Can't Trust Network Time by datenwolf on Sunday April 28, 2019 @06:29PM (#19774137)
Not all of these sources come through the Internet. Think GPS, GSM, radio time signals (DCF-77 or the likes).
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Re:You Can't Trust Network Time by misterkgb on Sunday April 28, 2019 @10:08PM (#19775295)
Those solutions all require additional hardware - hardware that's far more expensive than an on-board real-time clock and battery.
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