[aaa]

I have to fix it up twice a year with Summer changing time which is different +- 2 weeks than in Europ

[aaa]

From the spring 2007, the dates of beginning and end of the hour of summer for the United States are going to be displaced to answer the Energy Policy Act of 2005. The dates of the hour of summer in the United States will begin three weeks earlier (to 2h00 the morning the second Sunday of March) and will end one week later (to 2h00 the morning the first Sunday of November).

The territory of the United States is divided in four zones of hour: the borders of the zones don't follow those of the States, either for geographical reasons, either because of the zones of influence of some big cities in the little populated regions. it is earlier at the United States that in Europe, and jet lag must be subtracted therefore on European time to have the local hour. For example, when it is noon in Zurich, it is 6 o'clock in the morning in Boston, 5 hours in the morning in New Orleans, 4 hours in the morning at Denver and 3 hours in the morning in San Francisco. The passage at the hour of summer (Daylight Saving Time) doesn't make itself to the same date that in Europe, there is one hour of shift therefore in more between the last Sunday of March and the first Sunday of April.

[aaa]

I have to fix it up twice a year with Summer changing time which is different +- 2 weeks than in Europ

I have to fix it up twice a year with Summer changing time which is different from 1 to 3 weeks than in Europ

I don't know how Australia works...