Netgear M5300-28G-POE+ (GSM7228PSv1h2) - 12-Port Managed Gigabit Switch Administrator's Guide

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SNTP 
435
 Managed Switches
Web Interface: Set the Named SNTP Server
1. 
Configure the SNTP server.
a. Select System > Management > Time > SNTP Server Configuration
A screen similar to the following displays.
b.  Enter the following information:
In the Server Type list, select DNS
In the Address field, enter time-f.netgear.com
In the Port field, enter 123.
In the Priority field, enter 1.
In the Version field, enter 4.
c.  Click Add.
2. 
Configure the DNS server.
a. Select System > Management > DNS > DNS Configuration
A screen similar to the following displays.