BMC clock unable to sync time offset from RTC

BMC clock unable to sync time offset from RTC

[Zhang, ShuoX]

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Hi,
     I have a question and need your help. The time of bmc has always been UTC time. I set the time zone through the operating system and then reboot  bmc. Although the time is no longer 1970, the time is still UTC time.

     The following steps:
     1. From SUT Linux OS
     # timedatectl set-timezone Asia/Shanghai
     # hwclock -w
     # hwclock -r
     2021-08-12 23:47:04.936372+08:00

     2. Reboot BMC, the BMC will sync the clock with RTC
     3. HTTP GET /redfish/v1/Managers/bmc, check DateTime field, "DateTime" = "2021-08-12 15:47:04.936372+00:00"

     I think it should be when the os time is synced to the bmc, the time zone is not passed, if I want to get the time zone time, do I need to add one under the xyz.openbmc_project.Time.EpochTime interface of the xyz.openbmc_project.Time.Manager service Properties, or are there other ways?


root@intel-obmc:~# busctl introspect  xyz.openbmc_project.Time.Manager /xyz/openbmc_project/time/bmc
NAME                                TYPE      SIGNATURE  RESULT/VALUE     FLAGS
org.freedesktop.DBus.Introspectable interface -          -                -
.Introspect                         method    -          s                -
org.freedesktop.DBus.ObjectManager  interface -          -                -
.GetManagedObjects                  method    -          a{oa{sa{sv}}}    -
.InterfacesAdded                    signal    oa{sa{sv}} -                -
.InterfacesRemoved                  signal    oas        -                -
org.freedesktop.DBus.Peer           interface -          -                -
.GetMachineId                       method    -          s                -
.Ping                               method    -          -                -
org.freedesktop.DBus.Properties     interface -          -                -
.Get                                method    ss         v                -
.GetAll                             method    s          a{sv}            -
.Set                                method    ssv        -                -
.PropertiesChanged                  signal    sa{sv}as   -                -
xyz.openbmc_project.Time.EpochTime  interface -          -                -
.Elapsed                            property  t          1617931946881395 emits-change writable






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Re: BMC clock unable to sync time offset from RTC

[Patrick Williams]

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On Tue, Sep 28, 2021 at 10:52:18AM +0000, Zhang, ShuoX wrote:
> Hi,
>      I have a question and need your help. The time of bmc has always been UTC time. 

This is by design.  By default, we have the BMC always use UTC internally.  Any
alternative timezones are exposed only at external interfaces (such as the
webui).

Some people statically configure the BMC to another timezone, but I don't know
how well this is tested.  There is not currently any code to support dynamically
changing the timezone of the BMC.
 

-- 
Patrick Williams

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