STM32MP1) How to set the date and keep it ?

[hochul yoo]

Hello all ~

​I have STM32MP157A-EV1 and STM32MP157C-DK2. 

I want to change system time and keep it. 

But It is not working well. 

Below is the test log on EV1.

root@stm32mp1:~# date -s "20031025 18:00:00"
Sat Oct 25 18:00:00 UTC 2003
root@stm32mp1:~# date
Sat Oct 25 18:00:03 UTC 2003
root@stm32mp1:~#
root@stm32mp1:~# hwclock --systohc --utc
root@stm32mp1:~# hwclock
2003-10-25 18:00:18.632338+00:00
 
reboot ....
 
root@stm32mp1:~# date
Mon Jun 27 03:19:28 UTC 2022

Am I miss something?:sad_but_relieved_face: 

thanks. 

[Olivier GALLIEN · Accepted solution]

Hi @hochul yoo​ 

Topic already covered here :

https://st.force.com/community/s/question/0D53W000018ThWwSAK/hello-id-like-to-preserve-time-after-rebooting-when-no-internet-connection-is-present-every-time-i-reboot-i-get-the-same-date-which-i-presume-is-the-late-date-there-was-an-internet-connection-id-like-to-update-this-system-clock-with-the-cu...

Do you have a 3V battery on VBAT pin to keep time in absence of power ?

Olivier

[hochul yoo]

​Thanks,

I found the solution by link you provided. 

I need this commnd to set the system time from the RTC

hwclock --hctosys