Oracle Clusterware requires the same time zone setting on all cluster nodes.

• About Cluster Time Synchronization
  For the Microsoft Windows operating system, there are three different methods you can use to synchronize the time between the nodes of your cluster.
• Understanding Network Time Requirements
  Oracle Clusterware 12c Release 1 (12.1) is automatically configured with Cluster Time Synchronization Service (CTSS).
• Configuring the Windows Time Service
  The Windows Time service (W32Time) provides network clock synchronization on computers running Microsoft Windows.
• Configuring Network Time Protocol
  The Network Time Protocol (NTP) is a client/server application.
• Configuring Cluster Time Synchronization Service
  Cluster Time Synchronization Service (CTSS) is provided by Oracle to synchronize the time across the nodes in your cluster.