sntp - Syncs the system time and RTC against a SNTP or NTP server

Usage: sntp SERVER/A,NOSAVE/S,QUIET/S

SERVER: A NTP or SNTP server. They use the same protocol and return the same
        data, but the two types of clients work and use the data differently.
NOSAVE: Don't save the corrected time to either the system time nor the RTC.
QUIET:  Supress info output, but not errors.

Example:
1> sntp se.pool.ntp.org
Using env TZONE="CET-1" for UTC offset: -3600s west
se.pool.ntp.org is a stratum 2 server.
System clock is behind server by 192.860143s.
Correction applied to system time and RTC.