D-Link DFL-260-IPS-12 Product Manual - Page 133
Time Servers, Daylight Saving Time
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3.8.3. Time Servers Chapter 3. Fundamentals The world is divided up into a number of time zones with Greenwich Mean Time (GMT) in London at zero longitude being taken as the base time zone. All other time zones going east and west from zero longitude are taken as being GMT plus or minus a given integer number of hours. All locations counted as being inside a given time zone will then have the same local time and this will be one of the integer offsets from GMT. The NetDefendOS time zone setting reflects the time zone where the NetDefend Firewall is physically located. Example 3.21. Setting the Time Zone To modify the NetDefendOS time zone to be GMT plus 1 hour, follow the steps outlined below: Command-Line Interface gw-world:/> set DateTime Timezone=GMTplus1 Web Interface 1. Go to System > Date and Time 2. Select (GMT+01:00) in the Timezone drop-down list 3. Click OK Daylight Saving Time Many regions follow Daylight Saving Time (DST) (or "Summer-time" as it is called in some countries) and this means clocks are advanced for the summer period. Unfortunately, the principles regulating DST vary from country to country, and in some cases there can be variations within the same country. For this reason, NetDefendOS does not automatically know when to adjust for DST. Instead, this information has to be manually provided if daylight saving time is to be used. There are two parameters governing daylight saving time; the DST period and the DST offset. The DST period specifies on what dates daylight saving time starts and ends. The DST offset indicates the number of minutes to advance the clock during the daylight saving time period. Example 3.22. Enabling DST To enable DST, follow the steps outlined below: Command-Line Interface gw-world:/> set DateTime DSTEnabled=Yes Web Interface 1. Go to System/Date and Time 2. Check Enable daylight saving time 3. Click OK 3.8.3. Time Servers 133