How to change snapshot artifacts timezone?

I am using Maven version 3.0.4 and Nexus repository where to deploy Maven
created snapshot artifacts. How I can change snapshots timestamp timezone
from UTC to Europe/Helsinki ?

I have tried to set timezone with following JAVA_OPTS and MAVEN_OPTS but
those does not help with this issue. Any ideas?

JAVA_OPTS=-Duser.timezone=Europe/Helsinki
MAVEN_OPTS=-Duser.timezone=Europe/Helsinki

Br,
Kvartal00