如何計算javascript中兩個日期之間的天數？

Question

可能重複：
How to calculate the number of days between two dates using javascript

我有那些日期：

27/09/2011 
29/10/2011 

，我想天返回（在本例中的日期之間，應是33天）。

我該怎麼做的JavaScript（或jQuery？）？

Answer 1

function days_between(date1, date2) { 

    // The number of milliseconds in one day 
    var ONE_DAY = 1000 * 60 * 60 * 24 

    // Convert both dates to milliseconds 
    var date1_ms = date1.getTime() 
    var date2_ms = date2.getTime() 

    // Calculate the difference in milliseconds 
    var difference_ms = Math.abs(date1_ms - date2_ms) 

    // Convert back to days and return 
    return Math.round(difference_ms/ONE_DAY) 

} 

http://www.mcfedries.com/JavaScript/DaysBetween.asp

Answer 2

var daysBetween = (Date.parse(DATE1) - Date.parse(DATE2))/(24 * 3600 * 1000); 

Answer 3

// split the date into days, months, years array 
var x = "27/09/2011".split('/') 
var y = "29/10/2011".split('/') 

// create date objects using year, month, day 
var a = new Date(x[2],x[1],x[0]) 
var b = new Date(y[2],y[1],y[0]) 

// calculate difference between dayes 
var c = (b - a) 

// convert from milliseconds to days 
// multiply milliseconds * seconds * minutes * hours 
var d = c/(1000 * 60 * 60 * 24) 

// show what you got 
alert(d) 

注： 我覺得這個方法比Date.parse()安全爲您明確指定的日期格式是輸入（通過拆分到年，月，日的開始） 。這對於避免模糊不清是很重要的，因爲03/04/2008可能是3rd of April, 2008或4th of March, 2008，具體取決於您的日期來自哪個國家/地區。