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New York:
zone1.
offset= {-4, 56, 02}
ends= {{1883, 11, 18}, {12,03,57}, w}
or {{1883, 11, 18}, {12,03,57}, s}
or {{1883, 11, 18}, {16,59,59}, u}
from minimum
dst= none
% zone change
end= zone1.ends
zone2.
offset= {-5,0,0}
ends= {{1920,1,1}, {0,0,0}, w}
from zone1.ends+1sec
dst= none
% dst event
end= {{1918,3,31}, {1,59,59}, w}
or {{1918,3,31}, {1,59,59}, s}
or {{1918,3,31}, {6,59,59}, u}
from {{1918,3,31}, {7,0,0}, u}
dst= {1,0,0}
% dst event
end= {{1918,10,27}, {1,59,59}, w}
or {{1918,10,27}, {0,59,59}, s}
or {{1918,10,27}, {5,59,59}, u}
from {{1918,10,27}, {6,0,0}, u}
dst= none
% dst event
end= {{1919,3,30}, {1,59,59}, w}
or {{1919,3,30}, {1,59,59}, s}
or {{1919,3,30}, {6,59,59}, u}
from {{1919,3,30}, {7,0,0}, u}
dst= {1,0,0}
% dst event
end= {{1919,10,26}, {1,59,59}, w}
or {{1919,10,26}, {0,59,59}, s}
or {{1919,10,26}, {5,59,59}, u}
from {{1919,10,26}, {5,59,59}, u}
dst= none
% zone end
end= {{1919,12,31}, {23,59,59}, w}
or {{1919,12,31}, {23,59,59}, s}
or {{1920,1,1}, {4,59,59}, u}
zone3.
offset= {-5,0,0}
ends= {{1942,1,1}, {0,0,0}, w}
from {{1920,1,1}, {5,0,0}, u}
dst= none %from previous
GENERAL PATTERN
in zoneX.
offset= {HH,MM,SS}
end= {{Y,M,D},{HH,MM,SS}, w} %% usually wall-time, can be otherwise
from previous.ends +1sec
dst= previous.dst
calculate all times for begin (w/s/u)
foreach rule:
given begin, current dst and offset,
- calculate oldest change > begin %% may be none
nextRule= the rule with the earliest of these dates
if nextRule.start > zoneX.end:
end= zoneX.end-1sec
next_zone (offset & end)
else:
end= oldest.time-1sec
nextDst= nextRule.dst
nextBegin= end+1sec
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