How to verify my NTP working or not?

[cah]

ntpstat command

The ntpstat command will report the synchronisation state of the NTP daemon running on the local machine. If the local system is found to be synchronised to a reference time source, ntpstat will report the approximate time accuracy.
exit status

You can use the exit status (return values) to verify its operations from a shell script or command line itself:

• exit status 0 – Clock is synchronised.
• exit status 1 – Clock is not synchronised.
• exit status 2 – If clock state is indeterminant, for example if ntpd is not contactable.

Type the command as follows:

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$ ntpstat

Sample outputs:

synchronised to NTP server (149.20.54.20) at stratum 3

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   time correct to within 42 ms
   polling server every 1024 s
   

Use the echo command to display exit status of ntp client:

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$ echo $?

Sample outputs:

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0

ntpq command

The ntpq utility program is used to monitor NTP daemon ntpd operations and determine performance. The program can be run either in interactive mode or controlled using command line arguments. Type the following command

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cahtoh02:/root%ntpq -pn
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+204.2.134.163   44.24.199.34     3 u  614 1024  377   58.701   -0.559   9.248
 216.152.240.220 216.218.254.202  2 u  72h 1024    0   10.667    1.934   0.000
*209.208.79.69   130.207.244.240  2 u  479 1024  377   71.919    5.643   3.746

OR

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cahtoh02:/root%ntpq -p 
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+pacific.latt.ne 44.24.199.34     3 u  625 1024  377   58.701   -0.559   9.248
 216.152.240.220 216.218.254.202  2 u  72h 1024    0   10.667    1.934   0.000
*209.208.79.69   130.207.244.240  2 u  492 1024  377   71.919    5.643   3.746

The above is an example of working ntp client. Where,

-p : Print a list of the peers known to the server as well as a summary of their state.
-n : Output all host addresses in dotted-quad numeric format rather than converting to the canonical host names.