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Exadata OEL6 to OEL7 upgrade. DB TimeZone issue

Hello all.
After upgrading OS on Exadata dbnodes from OEL6 to OEL7, all corresponding databases were started with UTC time zone and "local" timezone was ignored.

[root@hostname~]# timedatectl
Local time: Wed 2021-03-03 12:46:04 PST
Universal time: Wed 2021-03-03 20:46:04 UTC
RTC time: Wed 2021-03-03 20:46:02
Time zone: America/Los_Angeles (PST, -0800)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: no
Last DST change: DST ended at
Sun 2020-11-01 01:59:59 PDT
Sun 2020-11-01 01:00:00 PST
Next DST change: DST begins (the clock jumps one hour forward) at
Sun 2021-03-14 01:59:59 PST
Sun 2021-03-14 03:00:00 PDT
[root@hostname~]# date
Wed Mar 3 12:46:17 PST 2021

So, the sysdate and systimestamp returns date in UTC instead of PST.
No changes in srvctl envs, server env variables, $GRID_HOME/crs/install/s_crsconfig_$HOSTNAME_env.txt were done.

Does anybody fased with similar?
What should check additionally ?

Post Details
Added on Mar 3 2021