Chapter 43 System

Table 197 System > Date and Time (continued)

LABEL

DESCRIPTION

End Date

Configure the day and time when Daylight Saving Time ends if you selected

 

Enable Daylight Saving. The at field uses the 24 hour format. Here are a

 

couple of examples:

 

Daylight Saving Time ends in the United States on the first Sunday of November.

 

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 First, Sunday, November

 

and type 2 in the at 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 at 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).

 

 

Offset

Specify how much the clock changes when daylight saving begins and ends.

 

Enter a number from 1 to 5.5 (by 0.5 increments).

 

For example, if you set this field to 3.5, a log occurred at 6 P.M. in local official

 

time will appear as if it had occurred at 10:30 P.M.

 

 

Apply

Click Apply to save your changes back to the ZyWALL.

 

 

Reset

Click Reset to begin configuring this screen afresh.

 

 

43.3.1 Pre-defined NTP Time Servers List

When you turn on the ZyWALL for the first time, the date and time start at 2003-01-01 00:00:00. The ZyWALL then attempts to synchronize with one of the following pre-defined list of Network Time Protocol (NTP) time servers.

The ZyWALL continues to use the following pre-defined list of NTP time servers if you do not specify a time server or it cannot synchronize with the time server you specified.

Table 198 Default Time Servers

0.pool.ntp.org

1.pool.ntp.org

2.pool.ntp.org

When the ZyWALL uses the pre-defined list of NTP time servers, it randomly selects one server and tries to synchronize with 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 servers have been tried.

43.3.2 Time Server Synchronization

Click the Synchronize Now button to get the time and date from the time server you specified in the Time Server Address field.

When the Please Wait... screen appears, you may have to wait up to one minute.

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ZyWALL USG 1000 User’s Guide