This information applies to the following HP switches:
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HP Switches provide a way to automatically adjust the system clock for Daylight Saving Time (DST) changes. To use this feature, define the month and date to begin and to end the change from standard time. In addition to the value "none" (no time changes), there are five pre-defined settings named:
The pre-defined settings follow these rules:
A sixth option named "User defined" allows you to customize the DST configuration by entering the beginning month and date plus the ending month and date for the time change. The menu interface screen looks like the following: (all month/date entries are at their default values):
Before configuring a "User defined" daylight time rule, it is important to understand how the switch treats the entries. Given the "Beginning day" and "Ending day", based on an algorithm from Sunday, the switch determines the date to change the system clock :
This is true for both the "Beginning day" and the "Ending day."
With that algorithm, you should use the value "1" to represent "first Sunday of the month," and a value equal to "number of days in the month minus 6" to represent "last Sunday of the month." This allows a single configuration for every year, no matter what date is the appropriate Sunday to change the clock.