Uniden GDVR 4A Series Owner's Manual page 32

DST Tab
Set the start and end time of daylight saving time by week or date.
FIelD
Enable
Time Offset
[Hours]
Mode
From
32
DescrIptIon
Turn DST on or off. This does not set DST; it turns the
system's ability to keep track of DST on or off.
Select 1 or 2 hour offset.
Set DST by week or by actual date.
Set DST beginning date. (Always the first Sunday of
October, offset 1 hr)
If mode = Week, set DST by month, number of week, day
of week, and hours to be offset (i.e., /the 1st/Sunday/1
hour offset)
If mode = Date, set DST by date according to popup
calendar.