REFERENCE
Description: Specifies when daylight saving time (DST) is observed. By default, the DST period is defined as the first Sunday in April to the last Sunday in October. (This is the period during which DST is observed in the United States.) The variables begin_month, begin_week, and begin_day define the month, week, and day, respectively, when DST begins. The variables end_month, end_week, and end_day define when DST ends. Months are 1 (January) through 12 (December); weeks are 1 through 4; days are 1 (Sunday) through 7 (Saturday). You can use negative numbers to specify the weeks, where -1 is the last week of the month, -2 is the second to last week, and so on. For example:
Defines DST as beginning in April (4), on the first week (1), on Sunday (1); and ending in October (10), on the last week (-1), on Sunday (1).
Default: DSTlaw=4,1,1,10, -1,1 (The first Sunday in April to the last Sunday in October)
UI equivalent: None
See also