You can check the current time, manually set the server's date and time, or have them set automatically using a network time server.
Choose the date format depending on your preference and geographic location.
Choose the display time in either 12-hour or 24-hour format.
Choose an option from the Time zone drop-down menu.
Choose Manually and select the date and time.
Note: To sync the date and time with a network time server, please make sure a valid DNS server IP has been entered at Main Menu > Control Panel > Network and that your DiskStation is connected to the Internet.
The main purpose of Network Time Protocol (NTP) is for synchronizing clocks of computer system over data network.
For more information about NTP Server, please visit http://support.ntp.org/bin/view/Servers/WebHome