NetApp
Configuration : System Tools > DateTime : Configuring date and time settings : Setting the date, time, and time zone for storage systems
Setting the date, time, and time zone for storage systems
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Configuration > System Tools > DateTime.
3.
Click Edit.
4.
Select the time zone.
5.
If you want to manually specify the date and time for your storage system, select Manual, and specify the date and time.
6.
If you want to use a time daemon to set the date and time, select Automatic.
a.
Select either SNTP or RDate as the time protocol.
Starting with Data ONTAP 8.0, Network Time Protocol (NTP) is the only supported protocol for time synchronization.
b.
Specify up to five time servers to synchronize the time.
The Up, Down, and Delete buttons are unavailable if you delete all the time servers from the list.
7.
Click OK.
8.
Verify the changes you made to the date and time settings.
Related reference 
DateTime window

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