Current Device
local time
This device's own clock, in its own time zone, as the browser sees it.
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NTP atomic-clock
UTC reference
The worldwide reference: atomic-clock UTC from an NTP service, shown in this device's time zone.
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Walk4Me Server
server time
The online server's clock, measured through a round trip and corrected for the network delay.
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NTP atomic-clock − Current Device
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Walk4Me Server − Current Device
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NTP atomic-clock − Walk4Me Server
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Each difference is the first clock minus the second, in seconds (and ms): positive, the first runs ahead; negative, behind. The ± is the measurement's uncertainty, half the round trip; the true value lies within it.