夏时制开始时，时钟时间将按此属性中指定的时间长度向前调整。
At the start of daylight saving time, the clock time is advanced by the length of time specified in this property.
如果此值为负值，则时钟时间会在夏时制开始时向后调整，而在夏时制结束时向前调整。
If this value is negative, the clock time is set back at the start of daylight saving time and advanced at the end.
比如说，美国最近将夏时制的开始时间推后了，这样现在已经进入了美国的夏时制而尚未进入欧洲的夏时制。
For example, the United States recently brought back the start of their Summer time, so now it's Summer time in the United States but not Summer time in Europe.
这份研究是应2005年能源法令的要求进行的，该法令同时将美国的夏时制时间延长了一个月，于3月第二个星期日开始至11月第一个星期日结束。
The study was mandated by the same 2005 energy act that extended U.S. daylight saving time an extra month, to begin on the second Sunday in March and end on the first Sunday in November.
这份研究是应2005年能源法令的要求进行的，该法令同时将美国的夏时制时间延长了一个月，于3月第二个星期日开始至11月第一个星期日结束。
The study was mandated by the same 2005 energy act that extended U.S. daylight saving time an extra month, to begin on the second Sunday in March and end on the first Sunday in November.
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