NetApp
Configuration > System Tools > DateTime : Configuring date and time settings : Setting date, time, and time zone
Setting date, time, and time zone
You can use Edit Date Time Settings dialog box to manually set the date, time, and time zone for your storage system. You cannot modify the date, time, and time zone settings for the unimpaired partner node or the failed node in an HA configuration after a takeover occurs.
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".
a.
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.
b.
Specify up to five time servers to synchronize time.
Note: 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.