SHELL=/bin/bash

# m h dom mon dow command

# standard to synch to local machine.
0,4,8,12,16,20,24,28,32,36,40,44,48,52,56 * * * * /usr/sbin/sntp -P no -r greendragon
or
0,4,8,12,16,20,24,28,32,36,40,44,48,52,56 * * * * /usr/bin/rdate -s -n greendragon
# -n is nntp which may not work with govt servers.

# one machine on the network uses this version, to synch externally.
#0 0,4,8,12,16,20 * * * /usr/sbin/sntp -P no -r time.nist.gov
#or
0 0,4,8,12,16,20 * * * /usr/bin/rdate -s time-c.nist.gov