Javascript DateDiff | 易学教程

问题

I am having a problem with the DateDiff function. I am trying to figure out the Difference between two dates/times. I have read this posting (What's the best way to calculate date difference in Javascript) and I also looked at this tutorial (http://www.javascriptkit.com/javatutors/datedifference.shtml) but I can't seem to get it.

Here is what I tried to get to work with no success. Could someone please tell me what I am doing and how I can simplify this. Seems a little over coded...?

//Set the two dates
var currentTime = new Date();
var month = currentTime.getMonth() + 1;
var day = currentTime.getDate();
var year = currentTime.getFullYear();
var currDate = month + "/" + day + "/" + year;
var iniremDate = "8/10/2012";

//Show the dates subtracted
document.write('DateDiff is: ' + currDate - iniremDate);

//Try this function...
function DateDiff(date1, date2) {
    return date1.getTime() - date2.getTime();
}

//Print the results of DateDiff
document.write (DateDiff(iniremDate, currDate);

回答1:

Your first try does addition first and then subtraction. You cannot subtract strings anyway, so that yields NaN.

The second trry has no closing ). Apart from that, you're calling getTime on strings. You'd need to use new Date(...).getTime(). Note that you get the result in milliseconds when subtracting dates. You could format that by taking out full days/hours/etc.

回答2:

Okay for those who would like a working example here is a simple DateDiff ex that tells date diff by day in a negative value (date passed already) or positive (date is coming).

EDIT: I updated this script so it will do the leg work for you and convert the results in to in this case a -10 which means the date has passed. Input your own dates for currDate and iniPastedDate and you should be good to go!!

//Set the two dates
var currentTime   = new Date()
var currDate      = currentTime.getMonth() + 1 + "/" + currentTime.getDate() + "/" + currentTime.getFullYear() //Todays Date - implement your own date here.
var iniPastedDate = "8/7/2012" //PassedDate - Implement your own date here.

//currDate = 8/17/12 and iniPastedDate = 8/7/12

function DateDiff(date1, date2) {
    var datediff = date1.getTime() - date2.getTime(); //store the getTime diff - or +
    return (datediff / (24*60*60*1000)); //Convert values to -/+ days and return value      
}

//Write out the returning value should be using this example equal -10 which means 
//it has passed by ten days. If its positive the date is coming +10.    
document.write (DateDiff(new Date(iniPastedDate),new Date(currDate))); //Print the results...

回答3:

function setDateWeek(setDay){
    var d = new Date();
    d.setDate(d.getDate() - setDay); // <-- add this
    var curr_date = d.getDate();
    var curr_month = d.getMonth() + 1;
    var curr_year = d.getFullYear();
    return curr_date + "-" + curr_month + "-" + curr_year;
}


setDateWeek(1);

回答4:

No need to include JQuery or any other third party library.

Specify your input date format in title tag.

HTML:

< script type="text/javascript" src="http://services.iperfect.net/js/IP_generalLib.js">

Use javascript function:

IP_dateDiff(strDate1,strDate2,strDateFormat,debug[true/false])

alert(IP_dateDiff('11-12-2014','12-12-2014','DD-MM-YYYY',false));

IP_dateDiff function will return number of days.

来源：https://stackoverflow.com/questions/12003660/javascript-datediff

标签

javascript

date

datediff