If you are not sure if the time of your Windows Server or Client is synchronized properly or if you would like to know which is the time source, you can use the following command lines (Start cmd with Administrator privileges):

net start w32time

w32tm /resync

w32tm /query /status

You should see something like this:

C:\Users\Administrator>w32tm /query /status
 Leap Indicator: 0(no warning)
 Stratum: 2 (secondary reference - syncd by (S)NTP)
 Precision: -6 (15.625ms per tick)
 Root Delay: 0.0468222s
 Root Dispersion: 7.7766938s
 ReferenceId: 0xC035676C (source IP: 192.53.103.108)
 Last Successful Sync Time: 2/9/2018 8:42:37 AM
 Source: ptbtime1.ptb.de,0x1
 Poll Interval: 10 (1024s)