Set time on Raspberry Pi

sudo timedatectl set-time '2018-10-02 09:53'

date -s "2 OCT 2006 18:00:00"

timedatectl set-time 04:00:00

sudo timedatectl set-time 04:00:00 
sudo timedatectl set-ntp false 
sudo timedatectl set-time 04:00:00 
sudo timedatectl
timedatectl set-ntp yes 

yum install ntp ntpdate
# systemctl start ntpd
# systemctl enable ntpd

# systemctl status ntpd

# ntpdate -u -s 0.centos.pool.ntp.org 1.centos.pool.ntp.org 2.centos.pool.ntp.org
Next, restart the ntpd daemon to synchronize CentOS NTP server date and time with your local date and time.

# systemctl restart ntpd
Now check using the timedatectl command if NTP synchronization is enabled and if it is actually synchronized.

# timedatectl
Lastly, using the hwclock utility, set the hardware clock to the current system time using the -w flag as follows.


# hwclock  -w

timedatectl list-timezones

tzselect

You can make this change permanent for yourself by appending the line
        TZ='Asia/Singapore'; export TZ
to the file '.profile' in your home directory; then log out and log in again.

Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:

Asia/Singapore

timedatectl set-timezone Asia/Singapore

## Dora - this solved my problem 2019-07-29 12:20 pm

https://www.raspberrypi.org/forums/viewtopic.php?t=222236
sudo apt install htpdate