如何得到当前一周和一个月的第一天？

问题描述

我有几件大事EX $ P $日期pssed中的毫秒 [1]，我想知道哪些事件是本周和本月内，但我不能找出如何获得运行一周的第一天（天/月/年），并将其转换为毫秒，同样对于该月的第一天

  [1]自1970年1月1日00:00:00 GMT
 

解决方案

本周以毫秒为单位：

  //获得今天天气晴朗的时候
日历CAL = Calendar.getInstance（）;
cal.set（Calendar.HOUR_OF_DAY，0）; //！明确不会重置一天中的小时！
cal.clear（Calendar.MINUTE）;
cal.clear（Calendar.SECOND）;
cal.clear（Calendar.MILLISECOND）;

//获取本周以毫秒为单位开始
cal.set（Calendar.DAY_OF_WEEK，cal.getFirstDayOfWeek（））;
的System.out.println（从这个星期开始的：+ cal.getTime（））;
的System.out.println（...毫秒：+ cal.getTimeInMillis（））;

//开始下一周
cal.add（Calendar.WEEK_OF_YEAR，1）;
的System.out.println（开始下周的：+ cal.getTime（））;
的System.out.println（...毫秒：+ cal.getTimeInMillis（））;
 

这一个月毫秒：

  //获得今天天气晴朗的时候
日历CAL = Calendar.getInstance（）;
cal.set（Calendar.HOUR_OF_DAY，0）; //！明确不会重置一天中的小时！
cal.clear（Calendar.MINUTE）;
cal.clear（Calendar.SECOND）;
cal.clear（Calendar.MILLISECOND）;

//获取月份开始
cal.set（Calendar.DAY_OF_MONTH，1）;
的System.out.println（开始的一个月的：+ cal.getTime（））;
的System.out.println（...毫秒：+ cal.getTimeInMillis（））;

//获取下月开始
cal.add（Calendar.MONTH，1）;
的System.out.println（开始下个月的：+ cal.getTime（））;
的System.out.println（...毫秒：+ cal.getTimeInMillis（））;
 

I have the date of several events expressed in milliseconds[1], and I want to know which events are inside the current week and the current month, but I can't figure out how to obtain the first day (day/month/year) of the running week and convert it to milliseconds, the same for the first day of the month.

[1]Since January 1, 1970, 00:00:00 GMT

解决方案

This week in milliseconds:

// get today and clear time of day
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 0); // ! clear would not reset the hour of day !
cal.clear(Calendar.MINUTE);
cal.clear(Calendar.SECOND);
cal.clear(Calendar.MILLISECOND);

// get start of this week in milliseconds
cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
System.out.println("Start of this week:       " + cal.getTime());
System.out.println("... in milliseconds:      " + cal.getTimeInMillis());

// start of the next week
cal.add(Calendar.WEEK_OF_YEAR, 1);
System.out.println("Start of the next week:   " + cal.getTime());
System.out.println("... in milliseconds:      " + cal.getTimeInMillis());

This month in milliseconds:

// get today and clear time of day
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 0); // ! clear would not reset the hour of day !
cal.clear(Calendar.MINUTE);
cal.clear(Calendar.SECOND);
cal.clear(Calendar.MILLISECOND);

// get start of the month
cal.set(Calendar.DAY_OF_MONTH, 1);
System.out.println("Start of the month:       " + cal.getTime());
System.out.println("... in milliseconds:      " + cal.getTimeInMillis());

// get start of the next month
cal.add(Calendar.MONTH, 1);
System.out.println("Start of the next month:  " + cal.getTime());
System.out.println("... in milliseconds:      " + cal.getTimeInMillis());

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