If this trick worked I believe the logical time zone of this mainframe is “U.S. Pacific coast time”.
And if you got a “green screen” connection to this mainframe you would also have this time stamp issue.
If not, the “green screen” session is configured with this TD=AUTO parameter (e.g. in NATPARM). Perhaps you should contact you administrator and ask him/her why this is not configured for the NDV server.
This is for local sessions when you execute programs on your pc. It has no influence for your SPoD session that execute the program on the NDV server. It is the TD value configured for Natural on the NDV server which takes effect.