Time and Date

The ZyWALL's Real Time Chip (RTC) keeps track of the time and date. There is also a software mechanism to set the time manually or get the current time and date from an external server when you turn on your ZyWALL.

Use this screen to configure the ZyWALL's time based on your local time zone.

Label
Description
Current Time and Date
 
Current Time
This field displays the ZyWALL's present time.
Current Date
This field displays the ZyWALL's present date.
Time and Date Setup
 
Manual
Select this radio button to enter the time and date manually. If you configure a new time and date, Time Zone and Daylight Saving at the same time, the new time and date you entered has priority and the Time Zone and Daylight Saving settings do not affect it.
New Time (hh:mm:ss)
This field displays the last updated time from the time server or the last time configured manually.
When you set Time and Date Setup to Manual, enter the new time in this field and then click Apply.
New Date (yyyy-mm-dd)
This field displays the last updated date from the time server or the last date configured manually.
When you set Time and Date Setup to Manual, enter the new date in this field and then click Apply.
Get from Time Server
Select this radio button to have the ZyWALL get the time and date from the time server you specified below.
Time Protocol
Select the time service protocol that your time server uses. Not all time servers support all protocols, so you may have to check with your ISP/network administrator or use trial and error to find a protocol that works.
The main difference between them is the format.
Daytime (RFC 867) format is day/month/year/time zone of the server.
Time (RFC 868) format displays a 4-byte integer giving the total number of seconds since 1970/1/1 at 0:0:0.
The default, NTP (RFC 1305), is similar to Time (RFC 868).
Time Server Address
Enter the IP address or URL of your time server. Check with your ISP/network administrator if you are unsure of this information.
Synchronize Now
Click this button to have the ZyWALL get the time and date from a time server (see the Time Server Address field). This also saves your changes (including the time server address).
Time Zone Setup
 
Time Zone
Choose the time zone of your location. This will set the time difference between your time zone and Greenwich Mean Time (GMT).
Enable Daylight Saving
Daylight saving is a period from late spring to early fall when many countries set their clocks ahead of normal local time by one hour to give more daytime light in the evening.
Select this option if you use Daylight Saving Time.
Start Date
Configure the day and time when Daylight Saving Time starts if you selected Enable Daylight Saving. The o'clock field uses the 24 hour format. Here are a couple of examples:
Daylight Saving Time starts in most parts of the United States on the first Sunday of April. Each time zone in the United States starts using Daylight Saving Time at 2 A.M. local time. So in the United States you would select First, Sunday, April and type 2 in the o'clock field.
Daylight Saving Time starts in the European Union on the last Sunday of March. All of the time zones in the European Union start using Daylight Saving Time at the same moment (1 A.M. GMT or UTC). So in the European Union you would select Last, Sunday, March. The time you type in the o'clock field depends on your time zone. In Germany for instance, you would type 2 because Germany's time zone is one hour ahead of GMT or UTC (GMT+1).
End Date
Configure the day and time when Daylight Saving Time ends if you selected Enable Daylight Saving. The o'clock field uses the 24 hour format. Here are a couple of examples:
Daylight Saving Time ends in the United States on the last Sunday of October. Each time zone in the United States stops using Daylight Saving Time at 2 A.M. local time. So in the United States you would select Last, Sunday, October and type 2 in the o'clock field.
Daylight Saving Time ends in the European Union on the last Sunday of October. All of the time zones in the European Union stop using Daylight Saving Time at the same moment (1 A.M. GMT or UTC). So in the European Union you would select Last, Sunday, October. The time you type in the o'clock field depends on your time zone. In Germany for instance, you would type 2 because Germany's time zone is one hour ahead of GMT or UTC (GMT+1).
Apply
Click Apply to save your changes back to the ZyWALL.
Reset
Click Reset to begin configuring this screen afresh.

When you turn on the ZyWALL for the first time, the date and time start at 2000-01-01 00:00:00. The ZyWALL then attempts to synchronize with an NTP time server from one of the 0.pool.ntp.org, 1.pool.ntp.org or 2.pool.ntp.org NTP time server pools. These are virtual clusters of time servers that use a round robin method to provide different NTP servers to clients.

The ZyWALL continues to use the NTP time server pools if you do not specify a time server or it cannot synchronize with the time server you specified.

Note: The ZyWALL can use the NTP time server pools regardless of the time protocol you select.

When the ZyWALL uses the NTP time server pools, it randomly selects one pool and tries to synchronize with a server in it. If the synchronization fails, then the ZyWALL goes through the rest of the list in order from the first one tried until either it is successful or all the pre-defined NTP time server pools have been tried.

The ZyWALL resets the time in the following instances: