NTP not updating back to system time in macOS

In macOS 10.12.6 , I am trying to forward the clock using the *date* command. E.g.: today's date is 25-09-2017 and I am setting it to 27-09-2017. But using ntp I am unable to revert my system time back to 25-09-2017. I have "time.asia.apple.com" set in /etc/ntp.conf. When I try to issue the command sudo killall -9 ntpd; sudo ntpdate "time.asia.apple.com" I am getting the following output: >27 Sep 20:25:36 ntpdate: no server suitable for synchronization found I am not sure why my system time is not moving back to 25th of Sep. I even tried it with "time1.google.com" . The clock is still not returning back to today's date.