Javascript，时间和日期：获取给定毫秒时间的当前分钟，小时，日，周，月，年

问题描述

我还在围绕这个图书馆，但是我没有时间，所以我只是跳到扰流板部分，问。有一个给定的，任意毫秒的时间值（像你从 .getTime（））中提供的那种，我如何获得当前的分钟，小时，日，周月，月，年以及特定毫秒级的年份？

此外，如何检索给定月份的天数？ / p>

解决方案

变量名应该是描述性的：

  var date = new Date; 
 date.setTime（result_from_Date_getTime）; 
 
 var seconds = date.getSeconds（）; 
 var minutes = date.getMinutes（）; 
 var hour = date.getHours（）; 
 
 var year = date.getFullYear（）; 
 var month = date.getMonth（）; //请注意：1月= 0; 2月= 1等。
 var day = date.getDate（）; 
 
 var dayOfWeek = date.getDay（）; //星期日= 0，星期一= 1等。
 var milliSeconds = date.getMilliseconds（）; 
  

给定月份的日子不会改变。在闰年，二月有29天。灵感来源于（感谢Peter Bailey！）

继续以前的代码：

  var days_in_months = [31，28，31，30，31，30，31 ，31，30，31，30，31]; 
 //闰年，二月有29天。检查
 // 2月29日是否在给定年份存在
 if（（new Date（year，1，29））。getDate（）== 29）days_in_month [1] = 29; 
  

没有一个简单的方式来获得一年的这个星期。有关该问题的答案，请参阅

I'm still wrapping my head around this library, but I'm out of time so I'll just skip to the spoiler section and ask. With a given, arbitrary millisecond time value (like the kind you'd gave from .getTime()), how do I get the current minute, hour, day, week of the month, month, week of the year, and year of that specific millisecond of time?

Additionally, how do I retrieve the number of days of a given month? Anything I should know about regarding leap years and other stuff?

解决方案

The variable names should be descriptive:

var date = new Date;
date.setTime(result_from_Date_getTime);

var seconds = date.getSeconds();
var minutes = date.getMinutes();
var hour = date.getHours();

var year = date.getFullYear();
var month = date.getMonth(); // beware: January = 0; February = 1, etc.
var day = date.getDate();

var dayOfWeek = date.getDay(); // Sunday = 0, Monday = 1, etc.
var milliSeconds = date.getMilliseconds();

The days of a given month do not change. In a leap year, February has 29 days. Inspired by http://www.javascriptkata.com/2007/05/24/how-to-know-if-its-a-leap-year/ (thanks Peter Bailey!)

Continued from the previous code:

var days_in_months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
// for leap years, February has 29 days. Check whether
// February, the 29th exists for the given year
if( (new Date(year, 1, 29)).getDate() == 29 ) days_in_month[1] = 29;

There is no straightforward way to get the week of a year. For the answer on that question, see Is there a way in javascript to create a date object using year & ISO week number?

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