Resolution:
The TIBCO products on OS/390 use LE, which has a default setting of GMT time.  If you need to see true local time then you need to adjust the LE module, as referred to below.

There are basically two places to get time from in OS/390.  One is from the CPU, (commonly) known as the hardware timer - the STCK assembler macro normally gets the time from here.  The other is from the operating system clock and this value is normally set in parmlib member (CLOCKXX).

Your system's hardware clock is set at GMT time, which is normally correct.

However, if you want to set the time to a local time, you can either:

- Change the hardware clock timer (which is normally not done)

or

- The "C" language function "time" will get the hardware clock time.  The function "localtime" will use the LE offsetted time if you have altered, compiled and linked the CEE.MACRO(EDCLOCTZ) macro to suit your location.  Doing this will offset the time for LE languages calls to the correct "localtime".

Where do I set the GMT offset for the rvd's SYSOUT logging in the Mainframe?