请问，纽约的夏时制是从什么时候开始和结束的。是否有规律可循。

有人说是三月第二个星期日，也有别的答案，所以我不是很确定，麻烦各位知道的告诉我。谢谢！

不光是纽约，是全美国！
现在是从三月的第二个周日早晨两点开始
十一月的第一个周日早晨两点结束（好像是，每年都记不住）

总的来说就是三月第二个星期日~2007年的时候从7个月改成了8个月~所以你看2007年以前的会有所不同~ Daylight Saving Time (DST)—also summer time in British English and European official terminology (see Terminology)—is the practice of temporarily advancing clocks during the summertime so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn.[1] Modern DST was first proposed in 1895 by George Vernon Hudson.[2] Many countries have used it since then; details vary by location and change occasionally. DST Rule Starts: Second Sunday in March Ends: First Sunday in November Time: 2 am local time Beginning in 2007, Daylight Saving Time was extended one month and the schedule for the states of the United States that adopt daylight saving time are: 2 a.m. on the Second Sunday in March to 2 a.m. on the First Sunday of November. U.S. Daylight Saving Time Year Spring Forward Fall Back 2004 2 a.m. April 4 2 a.m. Oct. 31 2005 2 a.m. April 3 2 a.m. Oct. 30 2006 2 a.m. April 2 2 a.m. Oct. 29 2007 2.a.m. March 11 2 a.m. Nov. 4 2008 2 a.m. March 9 2 a.m. Nov. 2 2009 2 a.m. March 8 2 a.m. Nov. 1 2010 2 a.m. March 14 2 a.m. Nov 7 2011 2 a.m. March 13 2 a.m. Nov. 6 2012 2 a.m. March 11 2 a.m. Nov. 4 2013 2 a.m. March 10 2 a.m. Nov. 3 2014 2 a.m. March 9 2 a.m. Nov. 2 2015 2 a.m. March 8 2 a.m. Nov. 1 2016 2 a.m. March 13 2 a.m. Nov. 6

规律就是从每年的三月第二个星期日凌晨2点开始到11月第一个星期日凌晨2点结束