Questions tagged [timekeeping]
Use this tag for any question related to keeping accurate time. Note there is a more specific "NTP" tag for questions related to that.
70 questions
2 votes
3 answers
6k views
Raspberry Pi 5 won't sychronize date and time
I used the RPi Imager on my Mac to setup RPi OS 64-bit (the recommended version for me). Immediately after booting for the first time, I noticed that the date is stuck on 12/5/2023 (the date of the ...
- 29
1 vote
0 answers
93 views
chrony takes many minutes to read refclocks after boot
I'm looking to provide precise time to a Raspberry Pi 4 without internet via a UBLOX GNSS module that sends NMEA sentences over UART and PPS to a GPIO. 15 NMEA sentences (ZDA, GGA, RMC, GSA, GBS, GSV) ...
- 180
-1 votes
1 answer
194 views
Make sure that RPi 400 clock is always synced
tl;dr Exactly what steps must a newbie like me undertake to configure RPi 400 in the way that it obtains current time from some official NTP server every time it boots up? I am just trying my first ...
- 141
3 votes
2 answers
369 views
Raspberry Pi network time, and accurate time for astronomy Data taking needs, at a loss
Does anyone know how to get network time for collecting data using Raspberry pis with no backup battery. Regular googling has gotten me things that do not work. They are Pi 4B with 4GB or 8 GB of RAM ...
2 votes
0 answers
2k views
How to make system clock to synchronize? [closed]
I bought a new RPi 4 model B. When doing the setup and setting an Internet connection, the RPi told me that the clock could not synchronize. After a couple of attempts I continued anyway, and obviusly ...
- 33
0 votes
1 answer
345 views
raspberry pico, circuitpython and how to receive mqtt feeds reliably while showing time on pico
I am building a clock using rpi pico, max7219 and wiznet5k. I am trying to incorporate mqtt functionality, in order to show important short messages to the max7219 every now and then. I have run into ...
- 37
-1 votes
2 answers
549 views
How will raspberry PI handle having Daylight savings time locked on
Congress has passed a bill to lock daylight savings time on. How will the PI handle this. What I mean by this is how will the PI know to use the "permanent" daylight savings time?
3 votes
1 answer
2k views
Is there a package or library for controlling the DS3231 on the Raspberry Pi
I've just obtained a DS3231 real time clock (RTC), and added it to my RPi 3b. It seems to work as far as keeping time, but I wanted more. I'd like to be able to set alarms to trigger the INT/SQW pin ...
anon
1 vote
2 answers
2k views
Let the RPi generate a pulse per second (PPS)
I'm trying to let the RPi generate a Pulse Per Second (PPS or 1PPS) to synchronize an external LiDAR with the RPi. The PPS is the only way to synchronize the LiDAR with the RPi and I can't use a GPS ...
- 19
1 vote
1 answer
435 views
RPI 4 Bluetooth Mobile Date & Time Sync [closed]
I am trying to build a carputer and I will have my mobile connected to RPI 4 through a external USB Bluetooth interface. The UI on the application will pick the time and date from Raspbian OS and will ...
- 11
1 vote
1 answer
2k views
Pi-Hole on Raspberry Pi 3 displays WRONG time
Excuse me Please: I am finding Pi-Hole to be displaying traffic events 5 hours into the future. i.e. current time: 1100, Pi-Hole Graph time: 1600. Raspberry Pi screen displays correct time for EST ...
- 11
0 votes
2 answers
97 views
What happens shortly after boot to affect timers?
I have a program that has ill effects if run from .bashrc and I've dug deeper and found a minimal reproducible example. The code below will print the elapsed time every second. If I run this program ...
- 33
3 votes
2 answers
513 views
Is there any way of synchronizing the system time with a numerical epoch timestamp?
When the raspberry turns on and it doesn't have an internet connection, the system time is wrong... On the context that I'm using the raspberry, it will not have any internet connection, but it will ...
- 133
0 votes
1 answer
245 views
Switch out the X1 Oscillator on a RPI
Just like a lot of people I'm using a RPi as a NTP server. There is a nice thread about it here: Switch out the X1 Oscillator on a RPI 2/3 User @colintd had a brilliant answer about switching the ...
0 votes
0 answers
556 views
How to configure the Pi to automatically sync its time with the first android device that connects to it
I have a Raspberry Pi that has no access to internet. It is configured as an access point that I can connect to using my smartphone or tablet. Time on the Raspberry Pi is never correct after booting ...
- 101