How to add min to current date/specific date and compare both dates in javascript?

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Session contain time(min).Either positive or Negative.I want to add that time in current date.If positive,it should get added.If negative,it should get reduced from that.I want to do it from javascript.

1 :

C#

var Time = '<%=Session["Time"]%>';
        var d1 = new Date(),
        d2 = new Date(d1);
        d2.setMinutes(d1.getMinutes() + Time);
        alert(d2);

When I am writing like this (above code) I am getting invalid date.

C#

var Time = '<%=Session["Time"]%>';
         var d1 = new Date(),
         d2 = new Date(d1);
         d2.setMinutes(d1.getMinutes() + 30);
         alert(d2);

When I am writing like this (above code) I am getting proper date.Is it a right way to add min to current date.

2 : I am selecting date from date picker,that gives me date like this '03/30/2016',I have another dropdownlist for selecting hours and min. I want to add hours and time in selected date.Hours is in 24.Time in 60.

C#

var d = new Date('03/30/2016');
        d.setHours(d.getHours() + 17);
        d.setMinutes(d.getMinutes() + 54);
        alert(d);

Is it a right way to do?

3 : I want compare both date d and d2. d should be greater than d2.If not,should show message to user.

What I have tried:

C#

var Time = '<%=Session["Time"]%>';
         var d1 = new Date(),
         d2 = new Date(d1);
         d2.setMinutes(d1.getMinutes() + Time);
         alert(d2);

When I am writing like this (above code) I am getting invalid date.

C#

var Time = '<%=Session["Time"]%>';
         var d1 = new Date(),
         d2 = new Date(d1);
         d2.setMinutes(d1.getMinutes() + 30);
         alert(d2);

Posted 29-Mar-16 19:13pm

Member 11589429

Updated 26-May-21 20:42pm

koolprasad2003

v3

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3 solutions

Solution 1

Here are small snippets you can club them to accomplish your task

- Add minutes in date in javascript

JavaScript

function addMinutes(date, minutes)
{
    return new Date(date.getTime() + minutes*60000);
}
//OR
addMinutes(new Date(2014,10,2), 60*24)

- Subtract minutes from date

JavaScript

var endDate = somedate;
var startdate = new Date(endDate);
var durationInMinutes = 20;
startdate.setMinutes(endDate.getMinutes() - durationInMinutes);

- Date difference in Javascript

JavaScript

var a = moment('7/11/2010','M/D/YYYY');
var b = moment('12/12/2010','M/D/YYYY');
var diffDays = b.diff(a, 'days');
alert(diffDays);

Posted 29-Mar-16 19:56pm

koolprasad2003

Updated 29-Mar-16 19:57pm

v2

Solution 3

For example if you wants to add any no. of hours to any date object.
For demonstration i will add 6.5 hours to current time.

const dt = new Date();
const newDt = new Date(dt.getTime() + (6.5 * 60 * 60 * 1000));

Posted 26-May-21 20:42pm

Member 11744041

Comments

Richard Deeming 28-May-21 4:57am

Which is exactly what solution 1 said five years ago!

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Karthik_Mahalingam · Accepted Answer · 2016-03-29T19:58:00

Solution 2

First you have to cast the Time to integer format

C#

var Time = '<%=Session["Time"]%>';

JavaScript

var timeInt = parseInt(Time);

To get Current Date value

JavaScript

var currentDate = new Date()

To Add Minutes

JavaScript

currentDate.setMinutes(currentDate.getMinutes() + YourValue )

To create a date from the drop down values use this

C#

var d = new Date(year, month, day, hours, minutes, seconds, milliseconds);

make milliseconds and seconds as 0 rest you can get from the picker and ddls.

Compare dates

JavaScript

if( d2 > d1) alert ('something'); else  alert ('something something');

Posted 29-Mar-16 19:58pm

Karthik_Mahalingam

Comments

Member 11589429 30-Mar-16 2:35am

Hi Kartik thanks for ur help.I am selecting date from date picker,that gives me date like this '03/30/2016',I have another dropdownlist for selecting hours and min. I want to add hours and time in selected date.Hours is in 24.Time in 60.As u said to use like this.var d = new Date(year, month, day, hours, minutes, seconds, milliseconds);Again I have to split date to get month,day and year.The code which I used is right to add min and hours in specific date.I showing 2 dates in alert box.Format of like this.One date is Wed Mar 30 2016 11:48:43 GMT+0530(India standard Time) and another is Tue Mar 29 2016 17:54:00 GMT+530(India standard Time). If (d2 > d) { alert('Scheduled date should be greater than current datetime'); }

Member 11589429 30-Mar-16 2:36am

Does it a right approach?

Karthik_Mahalingam 30-Mar-16 2:41am

yes, you can write this in many ways, this is one of the approach,
since we are using this cast[ Date(year, month, day, hours, minutes, seconds, milliseconds) ] it is safe and independent of the machine's datetime format.