Check the local clock against NTP servers.
On success: returns offset, server used, drift warning flag. On failure: returns offset=0 and error message. Never throws.
Optional
NTP server hostnames (default: pool.ntp.org).
Per-server query timeout (default: 5000ms).
Check the local clock against NTP servers.
On success: returns offset, server used, drift warning flag. On failure: returns offset=0 and error message. Never throws.