Pigeon RB100 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.
Read hardware clock date and time
Copy system time to hardware time
Copy hardware time to system time
- Set hardware clock date and time manually
hwclock --set --date "02/20/2016 11:10:00"
Change system time zone
- Select Internationalization options
- Select Time Zone
- Select Geographical area
- Select city or region
Network time synchronization
There's a systemd-timesync service running on a default install of Stretch. 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:
You can also watch systemd/clock:
pi@pigeon:~$ stat /var/lib/systemd/clock File: /var/lib/systemd/clock Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: b302h/45826d Inode: 18931 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 100/systemd-timesync) Gid: ( 103/systemd-timesync) Access: 2019-01-11 11:40:58.613881976 +0000 Modify: 2019-01-11 11:40:58.613881976 +0000 Change: 2019-01-11 11:40:58.613881976 +0000 Birth: -
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.
If you would like to change NTP servers (for example to a local one) edit file /etc/systemd/timesyncd.conf. The configuration parameters PollIntervalMinSec and PollIntervalMaxSec that can be set in /etc/systemd/timesyncd.conf are not recognized in current Raspbian. Default PollIntervalMaxSec is 2048 seconds.
Network time synchronization is enabled by default. To disable it use:
timedatectl set-ntp false
Comments are closed.