hhvm using UTC timezone?

hhvm.service

@@ -4,7 +4,7 @@ Description=HHVM HipHop Virtual Machine (FCGI)
 [Service]
 ExecStartPre=/bin/mkdir -p /var/run/hhvm
 ExecStartPre=/bin/chown -R gliders:nginx /var/run/hhvm
-ExecStart=/usr/local/bin/hhvm --user gliders --mode daemon -d hhvm.server.type=fastcgi -d hhvm.server.file_socket=/var/run/hhvm/sock -d hhvm.admin_server.port=9001 -d hhvm.admin_server.password=gliders9876
+ExecStart=/usr/local/bin/hhvm --user gliders --mode daemon -d hhvm.server.type=fastcgi -d hhvm.server.file_socket=/var/run/hhvm/sock -d hhvm.admin_server.port=9001 -d hhvm.admin_server.password=gliders9876 -d php.date.timezone=UTC
 #ExecStartPost=/usr/bin/python /home/gliders/code/gliders-tools/bin/warmup.py
 Restart=on-failure