You really should not attempt to access that server. Its restricted to .gov, .mil or stratum 2 servers. You should point your access to a ntp.org pool server.
How to use pool.ntp.org
Additionally, the specs say: "You must get approval from the server operator before you hardcode any IP addresses or hostnames. This is easy to get if your own organization runs the NTP servers you are planning to use. In most other cases you will not get it. "
Why not just call a pre-written utility to get the time for your timezone? It will save you a lot of work.
If you really want to implement a client, read
Simple Network Time Protocol RFC