now = new Date(+now + oneDay);

This code creates a new Date object that is one day ahead of the current date and time.

The "now" variable is assigned a new value that is the current date and time plus one day. The "oneDay" variable is not defined in this code, but it is likely a variable that contains the number of milliseconds in one day (i.e. 24 hours * 60 minutes * 60 seconds * 1000 milliseconds = 86,400,000).

So, assuming "oneDay" is defined as such, this code would create a new Date object that is exactly 86,400,000 milliseconds (or one day) ahead of the current date and time.

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中文详细解释now = new Date(+now + oneDay)

这行代码的意思是创建一个新的Date对象，其值为当前时间减去一天的时间。

具体来说，now表示当前时间的Date对象，oneDay表示一天的时间，它通常以毫秒为单位表示，即86400000毫秒。

通过将当前时间的毫秒数减去oneDay的毫秒数，我们可以获得当前时间减去一天后的时间的毫秒数。然后，我们可以使用这个值来创建一个新的Date对象，该对象表示当前时间减去一天后的时间。

例如，如果当前时间是2022年3月1日，那么执行now = new Date(now - oneDay)后，now将表示2022年2月28日的Date对象。

import datetime # a = datetime.datetime.now() def day_get(d): if type(d).__name__ == "str": d = datetime.datetime.strptime(d, '%Y-%m-%d %H:%M:%S') oneday = datetime.timedelta(days=1) day = d - oneday date_from = datetime.datetime(day.year, day.month, day.day, 0, 0, 0) date_to = datetime.datetime(day.year, day.month, day.day, 23, 59, 59) print('---'.join([str(date_from), str(date_to)])) def week_get(d): if type(d).__name__ == "str": d = datetime.datetime.strptime(d, '%Y-%m-%d %H:%M:%S') dayscount = datetime.timedelta(days=d.isoweekday()) dayto = d - dayscount sixdays = datetime.timedelta(days=6) dayfrom = dayto - sixdays date_from = datetime.datetime(dayfrom.year, dayfrom.month, dayfrom.day, 0, 0, 0) date_to = datetime.datetime(dayto.year, dayto.month, dayto.day, 23, 59, 59) datelist = [[str(date_from)], [str(date_to)]] # print('---'.join([str(date_from), str(date_to)])) return datelist def multi_week_get(d, num): if type(d).__name__ == "str": d = datetime.datetime.strptime(d, '%Y-%m-%d %H:%M:%S') date_num = [] # date_num = [date_to1] for i in range(num - 1, 0, -1): dayscount = datetime.timedelta(days=d.isoweekday()) dayto = d - dayscount sixdays = datetime.timedelta(days=6 * i) dayfrom = dayto - sixdays date_from = str(datetime.datetime(dayfrom.year, dayfrom.month, dayfrom.day, 10, 0, 0)) date_num.append(date_from) dayscount1 = datetime.timedelta(days=d.isoweekday()) onedays = datetime.timedelta(days=1) dayto1 = d - dayscount1 + onedays date_to1 = str(datetime.datetime(dayto1.year, dayto1.month, dayto1.day, 10, 0, 0)) date_num.append(date_to1) return date_num def month_get(d): if type(d).__name__ == "str": d = datetime.datetime.strptime(d, '%Y-%m-%d %H:%M:%S') dayscount = datetime.timedelta(days=d.day) dayto = d - dayscount date_from = datetime.datetime(dayto.year, dayto.month, 1, 0, 0, 0) date_to = datetime.datetime(dayto.year, dayto.month, dayto.day, 23, 59, 59) # print('---'.join([str(date_from), str(date_to)])) datelist = [[str(date_from)], [str(date_to)]] return datelist class op_date(object): def week_get(self, param): pass if __name__ == "__main__": op_date = op_date() # print(op_date.week_get("2023-06-09 23:00:00")[0]) print(op_date.week_get("2023-06-09 23:00:00")[1]) print(multi_week_get("2023-06-09 23:00:00", 4))

这段代码是关于日期时间的操作，包括获取前一天、上一周、上几周、上个月的起止时间。其中，day_get函数获取前一天的起止时间，week_get函数获取上一周的起止时间，multi_week_get函数获取上几周的起始时间，month_get函数获取上个月的起止时间。op_date类是一个日期时间操作的类，其中week_get是一个占位函数，可以在后续的开发中被具体实现。在代码的最后，通过实例化op_date对象并调用其中的函数来进行测试。