Time server on a non-domain virtual server

I'm building several servers that need to communicate with other exchange and SQL servers on our network.
These servers are virtual servers running on an ESX 5.5 hosts. What's the best way to make sure the time is setup to match the time on my Domain servers?
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David Johnson, CD, MVPOwnerCommented:
by default domain members get their time from the primary domain controller
wannabecraigAuthor Commented:
Yes, but as the subject says, this is a non-domain server
David Johnson, CD, MVPOwnerCommented:
Open UDP port 123 for outgoing traffic on firewall if needed.
Open UDP port 123 (or a different port you have selected) for incoming NTP traffic.

configure a manual time source

w32tm /config /manualpeerlist: peers /syncfromflags:manual /update

where peers specifies the list of DNS names or IP addresses of the NTP time source(s) that the selected computer will synchronize from. When specifying multiple peers, use a space as the delimiter and enclose them in quotation marks.

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Mr TorturSystem EngineerCommented:
And if you rather set up an external time server there are many you could use, for example time servers from pool.ntp.org :

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Windows Server 2012

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