2005年签署变更，2007年变更。。。

https://www.cnn.com/2007/EDUCATION/03/07/extra.daylight.saving/index.html#:~:text=The%20U.S.%20Department%20of%20Transportation,changes%20in%20the%20United%20States.&text=Part%20of%20the%20act%20will,ends%20on%20Sunday%2C%20November%204.

 

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• 谢谢，虽然每年不同，无线电接收并同步的规程应当不变吧？不知是何标准？ -chinomango- ♂ (0 bytes) () 09/03/2020 postreply 13:34:23