Cerio OW-400 A1 User Manual page 18

Mode: Administrator can select NTP Server or Manual.
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 NTP Server: System can auto update the system time. Administrator needs setting as NTP
Server.
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Default NTP Server: Administrator can select NTP Server.
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NTP Server: Administrator can setting as NTP Server.
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Time Zone: Administrator can select a desired time zone from the drop-down list.
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Daylight saving Time: Enable or disable Daylight saving.
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 Manual: Administrator must to set the system time.
Click "Save" button to save your changes. And click "Reboot" button to activate your changes
V4.0