First of all for correct time resolution with ntp you should select your correct time zone. Then your system will automatically adjusted or synchronous the machine time with the NTP server according to your time zone!!!!
But if you want to reset your time zone manually you should disable the "Network Time Protocol" and adjust it. If you change your time without disabling NTP, the machine will adjust the time to your selected time zone .
And for the command to adjust time you can use 'time' commnad. Please refer 'man time' for its syntax.
Hope this help!!!!!!!!!