Automatically determine the Hemisphere from the Latitude sign (>= 0 = Northern, < 0 = Southern). Consider other N/S hemisphere options if your Origin is Geocentric or different from the logic you want to apply.
NorthernHemisphere
Northern Hemisphere rules (DST typically observed during Apr–Oct, i.e., around June).
SouthernHemisphere
Southern Hemisphere rules (DST typically observed during Oct–Mar, i.e., around December). The following year is used to compute the end date.