![]() This step is required because option 2 is 32 bits long. In order to convert -14400 to an unsigned 32 bit value, perform this operation: 2^32 means 2 to the power of 32 = 4294967296. The number of seconds equivalent to - 4 hours = - 4 hours * (3600 second/hr) = - 14400 seconds. Note: 1hr = (60 minutes / hour) * (60 seconds / minute) = 3600 sec The appropriate value is calculated with these steps: ![]() In this case, the negative value changes the procedure. If a cable modem is used in a region that is GMT - 4 hours. The value placed in the DHCP pool configuration now becomes option. With a scientific calculator or a tool, such as the calculator application included with Microsoft Windows, convert 39600 to a hexadecimal value. The number of seconds equivalent to 11 hours = 11 hours * (60 minutes / hour) * (60 seconds / minute) = 39600 seconds. If a cable modem is used in a region that is GMT +11 hours, the appropriate value is calculated with these steps: Examples of How to Calculate the Hexadecimal Value of Time Offset Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. Time offset is based on Greenwich Mean Time (GMT) which defines a second as 1/86400 of a day, which is not 100 percent accurate. UTC is more precise than GMT because UTC measures time based on an atomic clock. The acronym UTC is an English-French mixture for Coordinated Universal Time (or its equivalent Temps Universel Coordonne) in order to make it language independent. NTP is used by machines on the Internet in order to synchronize with the UTC timescale. There is a common misconception about the difference between the time offset and Network Time Protocol (NTP). When you use the Cisco IOS DHCP server, the time offset value for a particular time zone is specified as an unsigned 32 bit hexadecimal value. ![]() Cisco routers that run a Cisco IOSĀ® release of 12.0(1)T or later have the ability to act as DHCP servers. The DHCP configurations option is available in many Cisco platforms, in particular in uBR7200, and all the other uBRs. This option is particularly important in cable environments. This document describes the procedure used in order to calculate the hexadecimal value for the time offset DHCP Option 2 when DHCP pools are configured in Cisco routers.
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