Daylight saving

Japan does not have daylight saving and I'm comfortable with it. Nothing complicated, no confusion. Now U.S.A seemed to make their clock 1 hour earlier on March 11th this year, 3 weeks earlier than before. I'm really not sure how daylight saving works. I hear it was created to save candles at night as people was able to have longer daylight if they made their clock 1 hour earlier when sun came out earlier and set latter in summer. Also people was able to get more sunshine with it.
It seems that Japan used to have daylight saving for a while but now we don't. I think it'll be very complicated if Japan has daylight saving again because when countries in the northern hemisphere make their clocks 1 hour earlier, countries in the south hemisphere do the opposite.

March 15th 2007 (today)
****North hemisphere ****
Japan --- 21:00
New York --- 8:00 (Daylight saving)
Chicago --- 7:00 (DS)
Saltlake city --- 6:00 (DS)
Los Angels --- 5:00 (DS)
Europe is still in winter time
Helsinki, Kiev,Athens,Istanbul --- 14:00
Rome,Paris,Berlin,Madrid,Prague --- 13:00
London,Dublin,Lisbon --- 12:00
****South Hemisphere ****
Welington --- 24:00 (DS)
Sydney --- 23:00(DS)
Perth --- 21:00(DS)


It'll be like below in this coming May
****North hemisphere ****
Japan --- 21:00
New York --- 8:00 (Daylight saving)
Chicago --- 7:00 (DS)
Saltlake city --- 6:00 (DS)
Los Angels --- 5:00 (DS)
Helsinki, Kiev,Athens,Istanbul --- 15:00(DS)
Rome,Paris,Berlin,Madrid,Prague --- 14:00(DS)
London,Dublin,Lisbon --- 13:00(DS)
****South Hemisphere ****
Welington --- 23:00
Sydney --- 22:00
Perth --- 20:00


And when countries in the north hemisphere make thier clocks 1 hour back, they do the opposite in the south hemisphere
****North hemisphere ****
Japan --- 21:00
New York --- 7:00
Chicago --- 6:00
Saltlake city --- 5:00
Los Angels --- 4:00
Helsinki, Kiev,Athens,Istanbul --- 14:00
Rome,Paris,Berlin,Madrid,Prague --- 13:00
London,Dublin,Lisbon --- 12:00
****South Hemisphere ****
Welington --- 24:00 (DS)
Sydney --- 23:00(DS)
Perth --- 21:00(DS)


When we see what's going on from Japan, Japan is 14 hours forward from New York in summer, 13 hours in winter. 1 hour backward from Sydney in summer ( in Japan), 2 hours in winter ( in Japan ). But if people see this in any countries that have daylight saving, time in the opposite hemisphere might be horrible lol.... Sydney is 14 hours forward from New York in summer ( in the north hemisphere ), 16 hours in winter. Additionally, each and every country that has daylight saving doesn't make their clocks forward/backward at the same time. Every country does that when it's convenient to them.
How do they describe the flight schedule for a flight that connects Europe and Australia via U.S.A TODAY!?!?!?!?!?!? lol.....
If Japan took daylight saving, I think people have to work by minding the time difference would have hard time for a while until they get used to it.

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