| CARVIEW |
Select Language
HTTP/2 200
date: Wed, 03 Sep 2025 04:08:01 GMT
content-type: text/html; charset=utf-8
content-encoding: gzip
cf-ray: 9792622f6b552ffb-BLR
cf-cache-status: DYNAMIC
cache-control: private
set-cookie: prov=2b804be3-88ba-4a6c-8c35-83a8ece8f4f3; expires=Thu, 03 Sep 2026 04:08:01 GMT; domain=.stackexchange.com; path=/; secure; httponly
set-cookie: prov=2b804be3-88ba-4a6c-8c35-83a8ece8f4f3; Path=/; HttpOnly; Domain=stackexchange.com
set-cookie: __cf_bm=LjC.wpA.yPSQZ3rvV9Ljz9ft5_13cof.9nYURSriEiA-1756872481-1.0.1.1-H6D2Mrn0LWLuc3.vd6v1sf0k.Ip9lLiR_4z6zYsMfT6C..eKgqabv_EEAGPDR5p6LcAXhpHswT1rwgowVwyNdbKP.1uqHT3PED3vyHpnb4w; path=/; expires=Wed, 03-Sep-25 04:38:01 GMT; domain=.stackexchange.com; HttpOnly; Secure; SameSite=None
set-cookie: _cfuvid=OKkGv41dOsmRK89jfHbVFBjrnrhIZaX5pRcdw.vSEkM-1756872481503-0.0.1.1-604800000; path=/; domain=.stackexchange.com; HttpOnly; Secure; SameSite=None
strict-transport-security: max-age=31536000; includeSubDomains
vary: Accept-Encoding
content-security-policy: upgrade-insecure-requests; frame-ancestors 'self' https://stackexchange.com
x-clacks-overhead: GNU Terry Pratchett
x-frame-options: SAMEORIGIN
x-request-guid: b40a595e-4427-4a5d-8093-22249f882e61
x-worker-origin-response-time: 288000000
x-dns-prefetch-control: off
server: cloudflare
Newest 'system-clock' Questions - Raspberry Pi Stack Exchange
Skip to main content
Stack Exchange Network
Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Visit Stack Exchange
Teams
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
Learn more about TeamsQuestions tagged [system-clock]
The system clock is part of the operating system that keeps time. The Raspberry Pi does not have a hardware clock, so for correctness the time is usually kept synced with a network source. It is also possible to add a clock device.
58 questions
- Bountied 0
- Unanswered
- Frequent
- Score
- Trending
- Week
- Month
- Unanswered (my tags)
0
votes
0
answers
100
views
Undefined reference to set_sys_clock_khz
I am trying to build this repo:
https://github.com/brendena/pico_device_and_host
However, after:
cmake ..
make
I get this:
[100%] Linking CXX executable USB_DEVICE_AND_KEYBOARD.elf
Memory region ...
0
votes
1
answer
227
views
Pi 400 Bullseye 11 digital clock format from 24-hour to 12 hour
Currently:
Digital Clock
Format %R
Tool tip format %A %x
Thank you in advance.
EDIT:
%R 24 hr %r 12 hr.
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 ...
3
votes
2
answers
445
views
Is running code in a pauseless loop damaging to the Pico W?
While True in main.py
Also good to know how inserting sleeps does or does not affect any clock cycles and if so by how much.
- 157
-1
votes
2
answers
3k
views
Why does the reported Pico W clock speed differ from its datasheet?
Datasheet: Up to 133mhz
print(str(machine.freq())) = 125000000 (hz, presumably)
- 157
0
votes
0
answers
3k
views
How to sync system clock?
I have built a custom Linux OS for Raspberry Pi CM4 using Buildroot. I am able to boot it but my system clock is not synchronized. Its set to some static time and I want to show real time instead. I ...
1
vote
2
answers
672
views
RasPi resets fake-hwclock time on USB Stick on reboot (Overlay FS)
Introduction:
To make sure my RasPi has the longest possible live duration, i've enabled read-only boot partition as well as the overlay filesystem.
I want to save the fake-hwclock.data (current ...
2
votes
0
answers
944
views
use internal clock (ROSC) to set system clock (clk_sys) to run at 32 MHz in RP2040
I am trying to set the system clock of my RP2040 to 32MHz using the internal clock(rosc) as source clock. When the pico board is powered on, the ROSC's frequency is around 5 MHz which lies in the ...
4
votes
1
answer
322
views
systemd-timesyncd always restarted once got Router Advertisement
On raspberry pi os, pi zeor 2 w, the systemd-timesyncd always restat once received Router Advertisement from router
The messages are like following:
Nov 28 12:22:46 raspberrypi dhcpcd[837]: wlan0: ...
6
votes
8
answers
29k
views
Raspberry pi cannot synchronize clock
I have bought three raspberry pi's with the intention of using them as temperature sensors throughout the building. I have bought the following models:
1 raspberry pi 4 model b 2gb
2 raspberry pi 4 ...
-1
votes
1
answer
118
views
Scaling down the SPI0 clock value on RPi 3B+/4B
I have a custom STM32 MCU board that interfaces with an RPi 3B+ via the SPI protocol. The MCU (STM32F407) has its SPI peripheral clock set at 84MHz and is configured as a slave device. For reliable ...
0
votes
3
answers
688
views
How to sync clock on raspberry pi with restricted internet traffic
I have a few raspberry pi's operating at a customer facility, and this facility has restricted the pi's traffic to only the IP of my server (digital ocean ubuntu droplet running a django application). ...
1
vote
2
answers
430
views
My applications clock(date and time) is too fast?
I have an electron.js application installed in a raspberry pi. The app displays date and time, the initial date and time is taken from a server and is incremented on the application using setInterval ...
0
votes
0
answers
77
views
I custom build rpi kernel that I misconfigured as the time specific syscalls return bad values. What steps should I take to debug this?
Jump down to edit 2 to see the most current information I have on this question. I am leaving everything else as a preamble explaining the situation.
I am setting up my first RPi to be a home DNS ...
2
votes
2
answers
1k
views
Allow non-root user to set system time
I am using Raspbian Buster on an Raspberry Pi 4. I would like to give permissions to a non-root user to be able to set the time with /bin/date -s. The user is going to be used to run a python script ...
- The Overflow Blog
-
-
- Featured on Meta
-
Hot Network Questions
- Why does Earth have the largest mean density of all the planets in the solar system?
- What did Jesus eat in relationship to his Jewish culture and tradition?
- The sum of an irreducible representation over a subset of a finite group.
- Were the Apollo probe/drogue separated after removal from the docking tunnel?
- Naming of parent keys and their modes
- If we have no free will, wherein lies the illusion?
- Looking for a short story collection, history of the universe starting with the big bang
- xargs -I {} not replacing with input string, says "/usr/bin/xargs: {}: No such file or directory"
- A question on the paper "Maximal unramified extensions of imaginary quadratic number fields of small conductors"
- How to find "minimal polynomial" of a rational number?
- Which vampiric power is being referenced in the following conversation?
- Conjecture possibly related to Hardy-Littlewood II
- Do the Apollo probe/drogues also serve as an airtight seal when not docked, or is there a separate seal?
- Which version of Amos 6:12 is closest to the original?
- Can a SATA hard drive be hot swapped?
- How to approach untraceable citation
- How to write "the positive sign is replaced by negative sign and negative sign by positive sign"?
- How can I attach the bottom of a window A.C. unit to the bottom of a window?
- Weird set builder notation I can't find elsewhere
- What is the measure of the new angle?
- Install PPA Version of Firefox over SNAP
- What is a voice leading (Guitar notation)
- c++ format_to verbosity
- What kind of bug is this?