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Previously the raw time difference was used which includes the network trip time between the node and the ntp server. This makes setting alerts off the value troublesome as it depends on the latency as well as the clock offset.
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ntp
The ntp package is a small implementation of a limited NTP client. It requests the current time from a remote NTP server according to selected version of the NTP protocol. Client uses version 4 of the NTP protocol RFC5905 by default.
The approach was inspired by a post to the go-nuts mailing list by Michael Hofmann:
https://groups.google.com/forum/?fromgroups#!topic/golang-nuts/FlcdMU5fkLQ