How to Find the Number of Days Between Two Dates

How to calculate number of days between two dates?

Here is a quick and dirty implementation of datediff, as a proof of concept to solve the problem as presented in the question. It relies on the fact that you can get the elapsed milliseconds between two dates by subtracting them, which coerces them into their primitive number value (milliseconds since the start of 1970).

/**
 * Take the difference between the dates and divide by milliseconds per day.
 * Round to nearest whole number to deal with DST.
 */
function datediff(first, second) {        
    return Math.round((second - first) / (1000 * 60 * 60 * 24));
}

/**
 * new Date("dateString") is browser-dependent and discouraged, so we'll write
 * a simple parse function for U.S. date format (which does no error checking)
 */
function parseDate(str) {
    var mdy = str.split('/');
    return new Date(mdy[2], mdy[0] - 1, mdy[1]);
}

alert(datediff(parseDate(first.value), parseDate(second.value)));

<input id="first" value="1/1/2000"/>
<input id="second" value="1/1/2001"/>

Finding the number of days between two dates

$now = time(); // or your date as well
$your_date = strtotime("2010-01-31");
$datediff = $now - $your_date;

echo round($datediff / (60 * 60 * 24));

Get calendar days between two dates

You don't need string manipulation to get a DateTime without the time part, just use DateTime.Date.

To get the time span between two dates, just subtract one from the other. Subtracting one date from another returns a TimeSpan object whose Days property is the difference in full dates.

All you need to do is :

Dim days As Integer =(date2.Date-date1.Date).Days

This way you avoid generating and parsing temporary strings.

How to calculate the number of days between two dates?

const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
const firstDate = new Date(2008, 1, 12);
const secondDate = new Date(2008, 1, 22);

const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay));

Calculate number of days between two dates?

Your program seems to work as intended. I'm getting 45.55 hours. Have you tried to run it locally?

Playground time is fixed, time.Now() will give you 2009-11-10 23:00:00 +0000 UTC always.

How to calculate number of days between two dates

http://momentjs.com/ or https://date-fns.org/

From Moment docs:

var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b, 'days')   // =1

or to include the start:

a.diff(b, 'days')+1   // =2

Beats messing with timestamps and time zones manually.

Depending on your specific use case, you can either

Use a/b.startOf('day') and/or a/b.endOf('day') to force the diff to be inclusive or exclusive at the "ends" (as suggested by @kotpal in the comments).
Set third argument true to get a floating point diff which you can then Math.floor, Math.ceil or Math.round as needed.
Option 2 can also be accomplished by getting 'seconds' instead of 'days' and then dividing by 24*60*60.

find the number of days between dates C#

There is no method called Convert.ToDayTime in the Convert class it should be Convert.ToDateTime().

The DateTime allows you to subtract its object from another object of the same type. then You can make use of the .TotalDays function to get the number of days. between those dates.

Use something like this:

DateTime futurDate = Convert.ToDateTime("08/21/2016");
DateTime TodayDate = DateTime.Now;
var numberOfDays = (futurDate - TodayDate).TotalDays;