This article will describe you to configure NTP server in windows server 2008/2012 in easiest way.
to set NTP server pl follow below 2 step.

1. you need to change registry setting so first take registry backup before changing .
    HKLM\System\CurrentControlSet\Services\W32Time\Parameters\NtpServer
    define here your NTP server name "1.asia.pool.ntp.org"

2. run following command
w32tm /query /status

Now you can check your system time, it should be sync with IST time server. :)
Enjoy...!!

Troubleshooting:

if your time is not syncing with time server, kindly run following command after entry in registry.

w32tm /config /manualpeerlist:"1.asia.pool.ntp.org" /syncfromflags:MANUAL

w32tm /query /status

Thanks
Raghvendra R Bhadauriya