javascript - How to compare subtract one date from another and get days? - Stack Overflow

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function createDate(d) {
   var year = parseFloat(d.substring(6, 10)); 
   var month = parseFloat(d.substring(0,2)); 
   var day = parseFloat(d.substring(3, 5)); 

   var d = new Date(year, month, day); 

   return d; 
}

var d1 = $("#DateCarArrival").val();
var d2 = $("#DateCarLeaving").val(); 

var date1 = createDate(d1); 
var date2 = createDate(d2);

console.log(date1.toString()); 
console.log(date2.toString());   

//       Mon Feb 18 2013 13:19:26 GMT+0100
//      Mon Feb 18 2013 13:19:26 GMT+0100

How to pare these dates and get the number of days they are in between?

function createDate(d) {
   var year = parseFloat(d.substring(6, 10)); 
   var month = parseFloat(d.substring(0,2)); 
   var day = parseFloat(d.substring(3, 5)); 

   var d = new Date(year, month, day); 

   return d; 
}

var d1 = $("#DateCarArrival").val();
var d2 = $("#DateCarLeaving").val(); 

var date1 = createDate(d1); 
var date2 = createDate(d2);

console.log(date1.toString()); 
console.log(date2.toString());   

//       Mon Feb 18 2013 13:19:26 GMT+0100
//      Mon Feb 18 2013 13:19:26 GMT+0100

How to pare these dates and get the number of days they are in between?

• javascript
• datetime

Share Follow edited Feb 18, 2013 at 12:30 Marko asked Feb 18, 2013 at 12:22 MarkoMarko 11k1717 gold badges7373 silver badges9393 bronze badges 2

• d.getFullYear(year, month, day); It can't work fine. See MDN, getFullYear doesn't have arguments. – VisioN Commented Feb 18, 2013 at 12:23
• @VisioN getFillYear or getFullYear ? O.o – Talha Akbar Commented Feb 18, 2013 at 12:24

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 7

NOTE: this answer is assuming a STRING of mm/dd/yyyy
If you use type="date" in Chrome, you will get strings of yyyy-dd-mm

DEMO

function createDate(d) {
   var year = parseInt(d.substring(6, 10),10); 
   var month = parseInt(d.substring(0,2),10); 
   var day = parseInt(d.substring(3, 5),10); 

   var d = new Date(year, month-1, day); // JS Months are 0 based
   return d; 
}

var d1 = $("#DateCarArrival").val();
var d2 = $("#DateCarLeaving").val(); 

var date1 = createDate(d1); 
var date2 = createDate(d2);

var aDay = 24*60*60*1000;
var diff = Math.abs((date1.getTime()-date2.getTime())/aDay)
console.log(date1.toString(),date2.toString(),diff);   

convert date to milliseconds(using valueOf()) and then substract

DifferNumDays = (date1.valueOf() - date2.valueOf())/(24*60*60*1000);

To get the difference (in days) and pare two dates, you can use these prototype extender methods:

Note: I've distributed the logic into multiple methods that can be used (as helpers) in many different scenarios.

/** Gets the type (name) of the specified object. 
 */
if (!Object.prototype.getType) {
    Object.prototype.getType = function (obj) {
        return ({}).toString.call(obj).match(/\s([a-z|A-Z]+)/)[1].toLowerCase();
    }
}

/** Checks whether the object is Date. 
 */
if (!Object.prototype.isDate) {
    Object.prototype.isDate = function (date) {
        return Object.getType(date) === 'date';
    }
}

/** Gets the difference in days, between the given dates. 
 *  If an invalid date is passed as a parameter, returns null.
 */
if (!Date.prototype.difference) {
    Date.prototype.difference = function (date1, date2) {
        if (!(Object.isDate(date1) && Object.isDate(date2))) return null;
        var diff = Math.abs(date1.getTime() - date2.getTime()),
            msInOneDay = 1000 * 60 * 60 * 24;
        return Math.round(diff / msInOneDay);
    }
}

/** Compares the date instance to the specified date value and returns an integer that indicates whether 
 *  the instance is earlier than, the same as, or later than the specified date value. 
 *  @return -1 if the specified date is invalid. 0 if they are the same. 1 if date1 is greater. 2 if date2 is greater.
 */
if (!Date.prototype.pareTo) {
    Date.prototype.pareTo = function (date) {
        if (!Object.isDate(date)) return -1; //not a Date
        if (this == date) {
            return 0;
        } else if (this > date) {
            return 1;
        } else {
            return 2; //date > this
        } 
    }
}

Usage:

//Validate a date object
var dateIsValid = Object.isDate(date1);
//get the difference in days
var numOfDaysBetween = Date.difference(date1, date2);
//pare date to another
var parison = date1.pareTo(date2);

You could convert the dates to milliseconds with getMilliseconds(), subtract them and count it from milliseconds.

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