RTC

Pigeon RB700 has a real-time clock with a backup battery (CR2032). When the system starts, it takes the time from the RTC if system clock update is failed through NTP.

Useful commands

• Read hardware clock date and time

  hwclock

• Copy system time to hardware time

  hwclock -w

• Copy hardware time to system time

  hwclock -s

• Set hardware clock date and time manually

  hwclock --set --date "02/20/2016 11:10:00"

Change system time zone

• Run:

  raspi-config

• Select Localisation options
• Select Timezone

Network time synchronization

There's a systemd-timesync service running on a default install of Raspberry Pi OS. Systemd-timesyncd is a daemon that has been added for synchronizing the system clock across the network. It implements an SNTP client. Make sure the machine is allowed to query servers over port 123/udp.

To check the service status, use:

timedatectl

The Access/Modify/Change times on this file show when systemd-timesynd last touched it.

Restarting the systemd-timesyncd service force a sync:

systemctl restart systemd-timesyncd

Systemd-timesyncd automatically updates the hardware clock after sync.

Network time synchronization is enabled by default. To disable it use:

timedatectl set-ntp false