Daylight Saving Time start date.
In recurring mode (format 1): week wday month hh:mm
In recurring mode (format 2): RJul n hh:mm
In date mode: month day year hh:mm
week: 0-6 (0=First, 6=Last)
wday: 1-7 (Sunday-Saturday)
month: 1-12 (January-December)
day: 1-31
year: 0-99 (2000-2099)
hh: 0-23 (hours)
mm: 0-59 (minutes)
n: 0-365 (zero-based Julian day of the year. Leap days shall be
counted, and it is possible to refer to February 29).
Format 2 for recurring mode is used only in the dynamic entry and
should not be used in the static entry (with index 1).