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You can sync with a time server in any location. It's best to choose ones that are near in network times to minimise differences (jitter) in packet transmission time over the network.
The task is made easy by the NTP pool project which coordinates time servers by regions. The Singapore pool (sg.pool.ntp.org) has five servers. The NTP pool project advises that is not enough so the Asia pool (asia.pool.ntp.org) should be used instead.
If you have an ntpd version that supports the pool directive (4.2.6p1 did, maybe earlier), /etc/ntp.conf can have:
My own ntpd.conf uses the Indian pool followed by the Asian pool. Maybe that's not good practice:
# Time sources
# Using pool method from /usr/share/doc/ntp-4.2.6p1/html/manyopt.html#pool
# also at http://www.eecis.udel.edu/~mills/ntp/html/manyopt.html#pool
# For India
# (Asia also required because India is inadequate)
Another factor to consider is the quality of network connections. Singapore might have better (= faster, lower latency, less jittery) network connections to say USA than to some of the servers in the asia.pool.ntp.org pool.