Can you please look into my code which is calculate difference between two date without using built in method?

Question

1.00/5 (2 votes)

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JavaScript

var obj = { 
  day: '', 
  month: '',
  year: ''
};
var months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

var countLeapYear  = function () {
  var y = this.year;
  if(this.month <= 2){
    y--;
  }
  return y/4-y/100+y/400;
};

var bound1 = countLeapYear.bind(obj);
var bound2 = getDifferenceDay.bind(obj);
function getDifferenceDay(Day1, Day2){
  var a = Day1.year*365 + Day1.day;
  for(var i=0; i<Day1.month - 1; i++ ){
    a += months[i];
    a += countleap(Day1);
  }
  var b = Day2.year*365 + Day2.day;
   for(var i=0; i<Day1.month - 1; i++ ){
    a += months[i];
    a += countleap(Day1);
  }
  return (b - a);
}

var Day1 = '1, 2, 2000';
var Day2 = '1, 2, 2004';
var obj1 = new getDifferenceDay();
console.log(obj1.getDifferenceDay(Day1, Day2));

What I have tried:

I tried to calculate days between two dates without any javascript built-in method

Posted 15-Nov-18 8:02am

Member 14056052

Updated 15-Nov-18 10:18am

Patrice T

v2

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Comments

W∴ Balboos, GHB 15-Nov-18 14:37pm

Did you run it? Does it work? What is it that you want us to do?

Not using built-in methods? Does that mean for the date difference or does it mean anything having to do with dates?

Please revise your question to a specific question.

Member 14056052 16-Nov-18 13:41pm

I need to calculate the difference between two dates in javascript without using built-in library

Richard Deeming 16-Nov-18 8:54am

Well, it's clearly not going to work. Your getDifferenceDay function expects two objects with day, month, and year properties; you're passing in two strings, which don't have those properties.

The function getDifferenceDay returns a number. You're calling it as a constructor, and then trying to call the getDifferenceDay method on that returned value, which won't work. Just call the function directly.

It's also extremely messy. What is the purpose of the obj variable? What are the two bind calls meant to be doing?

Member 14056052 16-Nov-18 13:59pm

Thanks for replying. I tried this one but i am getting NaN
var Day1 = {
day1: '',
month1: '',
year1: ''
};
var Day2 = {
day2: '',
month2: '',
year2: ''
};
var months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

var countLeapYear = function () {
var y = this.year1;
if(this.month <= 2){
y--;
}
return y/4-y/100+y/400;
};

var getDifferenceDay = function (Day1, Day2){
var a = Day1.year1*365 + Day1.day1;
for(var i=0; i<Day1.month1 - 1; i++ ){
a += months[i];
a += countleap(Day1);
}
var b = Day2.year2*365 + Day2.day2;
for(var i=0; i<this.month1 - 1; i++ ){
a += months[i];
a += countleap(Day2);
}
return (b - a);
}

var Day1 = '1, 2, 2000';
var Day2 = '1, 2, 2004';
console.log(getDifferenceDay(Day1, Day2));

Can you please help me out if possible

Richard Deeming 16-Nov-18 14:05pm

Once again:

The getDifferenceDay function expects two parameters. In your updated function, the first parameter needs to have properties called day1, month1, and year1; the second parameter needs to have properties called day2, month2, and year2.

You are passing in two strings.

The string class[^] does not contain any of those properties.

Instead of:

var Day1 = '1, 2, 2000';

you need:

var Day1 = { day1: 1, month1: 2, year1: 2000 };

Similar change for Day2.

Member 14056052 16-Nov-18 14:16pm

Actually I want to pass this date as parameter into function. That's the reason its empty. I need to change code every time in order to get the day difference.
I want to pass something like this.

var Day1 = '1, 2, 2000';
var Day2 = '1, 2, 2004';
console.log(getDifferenceDay(Day1, Day2));

Richard Deeming 16-Nov-18 14:21pm

I don't know how else to explain this to you: if you pass in a string value like '1, 2, 2000', then it will not have day, month and year properties.

You need to pass in an object which has those properties.

What you're doing at the moment is like taking a photograph of a Ferrari, and trying to climb into it to go for a drive.

Member 14056052 16-Nov-18 14:44pm

Can you please modify my code in order to get expected result ?
Actually i am new to javascript

Richard Deeming 16-Nov-18 15:02pm

This should fix the obvious errors:

var months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

var countLeapYear = function (date) {
    var y = date.year;
    if (date.month <= 2){
        y--;
    }
    return y/4 - y/100 + y/400;
};

var getDifferenceDay = function (startDate, endDate){
    var a = startDate.year * 365 + startDate.day;
    for (var i = 0; i < startDate.month; i++) {
        a += months[i];
        a += countLeapYear(startDate);
    }
    
    var b = endDate.year * 365 + endDate.day;
    for (var i = 0; i < endDate.month; i++) {
        b += months[i];
        b += countLeapYear(endDate);
    }
    
    return b - a;
}

var day1 = { day: 1, month: 2, year: 2000 };
var day2 = { day: 1, month: 2, year: 2004 };
console.log(getDifferenceDay(day1, day2));

I'm still not convinced by the logic of your calculation. But it's your homework, so you'll need to fix that. :)

Member 14056052 17-Nov-18 7:29am

Thanks man for replying on the above.

It is possible to take the input value from html form

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