public ntp servers, asian region
JIMz
japan
0.jp.pool.ntp.org
1.jp.pool.ntp.org
2.jp.pool.ntp.org
3.jp.pool.ntp.org
singapore
0.sg.pool.ntp.org
1.sg.pool.ntp.org
2.sg.pool.ntp.org
3.sg.pool.ntp.org
hongkong
1.hk.pool.ntp.org
1.asia.pool.ntp.org
2.asia.pool.ntp.org