Time and date issue

i've been having a similar problem in 10.10.x caused a lot of headaches.
I've changed our internal time servers (changed where the macs point to), added backup ones, none seem to work - we still get machines drifting.

This thread

also thisone
.

Are they dual boot machines? Windows deals with time differently than OS X so dual boot machines will often end up out of whack after being in Windwos until they next make an ntp checkup.
If this is the case the easiest way to deal with it is to have a startup event that makes an ntp call otherwise the time tends to be wrong until after you have logged in.

I have seen this on one machine (out of ~2000 identical devices). The time server and the time zone are correct, but the clock is set to 15 hours later. If I disconnect the time server and manually set the time, all is good. Once I reinstate the time server, the time once again jumps forward 15 hours. I get the same result when I use an internal time server or the Apple Americas time server.

The problem device is still covered under AppleCare, so back it goes. I will repost once I know what they have determined is the issue.

@Look We are not using dual boot machines. we are just using Mac OS x and Microsoft remote desktop to access our windows side. i think this Microsoft remote desktop not doing this issue right?

If your using Microsoft Remote Desktop to access a terminal server it would not be doing it.
A local VM i.e. parrelels shouldn't mess with the system clock either. It's only if your actually booting Windows directly from a local drive that you generally have issues.
If you have what @lwindram is describing, then that sounds like a time zone issue to me, either the time zone is wrong, or it is displaying wrong (change it and change it back perhaps), or some other issue is causing the translation of it to be incorrect. NTP is clearly changing the time, but then the time zone translation is resulting in it ending up a set number of hours out away from correct.

Time zone is correct, it's just the time that is changing? Are you pointing to a single time server or are there multiple ones in round-robin DNS? Perhaps one's time is off. Alternatively, set your time server temporarily to time.apple.com, if your firewall allows outbound NTP access.

Could also have a policy that runs periodically with:

ntpdate -u time.apple.com

(if you run this from a Terminal session, don't forget to precede this with sudo).

We set the time zone correct. but the issue is even we set a Single time server it just change randomly. sometime clock will go 2hrs advance or 15 sec advance.this happen for some macbook only. but even the time change our time server is still set on the macbook. we already tried two time server but it has same issue, time changes randomly.