Sunday is more like Monday than it used to be. Places of business that used to keep daytime“ business hours” are now open late into the night. And on the Internet, the hour of the day and the day of the week have become irrelevant(不相关的). A half century ago in the United States, most people experienced strong and precise dividing lines between days of rest and days of work，school time and summer time. Today the boundaries still exist, but they seem not clear.
