Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Fri, 25 Feb 2005 17:57:32 +0900

liushu wrote:
> Hi,everyone!
> Our epics release is base3.13.8, in July we set environment variables in config/CONFIG_SITE_ENV such as
> 
> EPICS_TS_MIN_WEST=-420
> EPICS_TS_NTP_INET=***.***.***.***
> 
> in order that the IOC's time is the same to the NTP server.
> 
> But now, in Feb,when we run the command "date" on the IOC, we find
it's late one hour than normal, Because here we have no daylight saving
time,so we have to modified the "EPICS_TS_MIN_WEST=-480".
> 
> 
> Does that mean we must modify the "EPICS_TS_MIN_WEST" every year? Who
> 
know how can cancel the daylight saving time?
> 
Looking at the code you attached, you can define TIMEZONE environment
variable
instead of EPICS_TS_MIN_WEST. How about defining  TIMEZONE as:

TIMEZONE=UTC::-420:0:0

Regards,

Noboru

> I only find some script in the base/src/db/drvTS.c like these:
> 
> 
> 
>  /*
> 
>     This section sets up the vxWorks clock for use with the ansiLib
> 
>     functions.  The TIMEZONE environment variable for vxWorks is only
> 
>     overwritten if it has not been set.  It seems as though the day
> 
>     light saving time does not work (at least following the directions
> 
>     in ansiLib).
> 
>  
> 
>     The EPICS environment variable EPICS_TS_MIN_WEST holds the minutes
> 
>     west of GMT (UTC) time.  This variable should be preset by the EPICS
> 
>     administrator for your site.
> 
>     */
> 
>  
> 
>  
> 
> if(getenv("TIMEZONE")==(char*)NULL)
> 
>     {
> 
>         if(envGetConfigParam(&EPICS_TS_MIN_WEST,sizeof(min_west),min_west)==NULL
> 
>           || strlen(min_west)==0)
> 
>         {
> 
>             TSprintf("TS initialization: No Time Zone Information\n");
> 
>         }
> 
>         else
> 
>         {
> 
>             sprintf(tz,"TIMEZONE=UTC::%s:040102:100102",min_west);
> 
>             if(putenv(tz)==ERROR)
> 
>             {
> 
>                 TSprintf("TS initialization: TIMEZONE putenv failed\n");
> 
>             }
> 
>         }
> 
>     }
> 
>  
> 
>     TSdriverInit(); /* Call the user's driver initialization if supplied */
> 
>     return 0;
> 
> }
> 
> 　Best regards
>  				
> 
>  Liushu  
>  Control Group, Accelerator Center
>  Institute of high energy physics (IHEP)
>  P.O.Box 918-10,100039
>  Beijing, P.R.China
>  Tel: +86-10-88236274-804,   Fax: +86-10-88236190
>  e-mail: [email protected]
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System