pool.ntp.org: public ntp time server for everyone
I recommend everyone this awesome ntp time server by NTP Pool Project. Visit their web site here.
If you’re using a recent Windows version, you can use the ntp client that is built into the system. As administrator enter the syntax below at the cmd prompt:
w32tm /config /syncfromflags:manual /manualpeerlist:0.pool.ntp.org,1.pool.ntp.org,2.pool.ntp.org,3.pool.ntp.org