Those servers is part of an international pool of servers and didn't work for me either, but closer/local ones did.
So edit your /etc/ntp/ntpd.conf
From:
https://www.pool.ntp.org/zone/in
server 0.in.pool.ntp.org
server 1.in.pool.ntp.org
server 2.in.pool.ntp.org
server 3.in.pool.ntp.org
or from
https://www.pool.ntp.org/zone/pk
server 0.asia.pool.ntp.org
server 1.asia.pool.ntp.org
server 2.asia.pool.ntp.org
server 3.asia.pool.ntp.org
Somehow I found out it helps to get started by setting the date manually to something close
https://time.is
# date 012420402020.48 --> MMDDhhmmyyyy.ss Month Day hour minute year. seconds
Check back in a few minutes, it must have synchronized