# JQuery :: Calculate Number Of Months Between Date Ranges?

Aug 3, 2010

For a project that would be too hard to explain, I am working with date ranges. There is a begin date and an end date. With those two variables, I need a function to calculate the number of months between both dates. To be more precise, I need a count of all unique month names in the dates (or month numbers if that is easier) where the range includes the beginning date, the end date, and all dates in between. So I am not looking for full months or an approximation. If only, say, one day of a given month is included in the date range, that adds a month. Also the range can span several years, january 2010 and january 2011 need to count for two different months.

## Calculate Date Ranges Using Script?

Sep 12, 2011

I'm fairly new to programming in Javascript and quite frankly find it difficult (an old COBOL programmer). My question is this, are their any functions in Javascript that are similar to the VB.Net "DateDiff" function? If not, are their any free code snippets that will calculate the range of days and/or months between 2 date values?

## Date Comparison In Months - 2 User Input To Ensure That Date2 Is At Least 2 Months After Date1

Jul 20, 2009

how to compare 2 user input dates (say Date1 and Date2) in dd/mm/yyyy format, to ensure that Date2 is at least 2 months after Date1. Comparing them in days is simple but I'm not sure where to start on months, taking into account differing number of days per month and leap years. e.g 01/01/2009 - 28/02/2009 would equal 2 months.

## JQuery :: Get Number Of Full Calendar Months Between 2 Dates?

Aug 11, 2010

working further on my project lined out in a previous post - here's another pickle:

I have two dates set, a beginning date and an end date for a period of time. That period can span several years. I now need to calculate the months in that period in accordance with the following reasoning:

[Code]...

## Add 3 Months To Date Var

Jan 25, 2006

I want get a date, which is taken from a form field, in the format dd/mm/yyyy, and add 3 months to it - what the best way?

## Adding Months To Entered Date?

Apr 18, 2011

I need to add 18 months to a date entered on a form and show the results to the user without the time. so a date like 1/1/2000 is entered and the results should be 06/30/2001. I am parsing the string and adding 18 months of milliseconds to the date. While I have gotten this to work, it is not correct because each month has a different # of days.

add 18 months to a date entered by a user?

Code:
var str = document.form1.startdate.value;
var d1 = Date.parse(document.form1.startdate.value);
var d7 = d1+86400000*30*18;

[Code]....

## JQuery :: Calculate Number Of Inputs Where Name Starts With Name^ And Input Value Is>0?

Sep 8, 2010

I have many inputs with name totalsum1,totalsum2,totalsum3 etc. I need to calculate number of inputs where name starts with "totalsum" and value is >0. I need to send result to another input with id="#rowtotal".My code:

\$("#rowtotal").val((\$("input[name^=totalsum]").val>0).size()); It's not working. Best RegardsRafa� Koszyk

## Calculate The Percentage Of A Number?

Apr 12, 2011

I want to calculate the percentage of a number, but I'm getting a really weird result. In the following code f is equal to 3 and x.length is equal to 8. The part that isn't working is emphasised in bold. Basically 3/8 * 100 should result in 37.5 but the result I am getting with the following code is 7934570.3125. How do you calculate this percentage in Javascript?

function displaymember()
{
var m = 1;

[code]...

## Calculate Number Of Nights?

Dec 8, 2009

I have a form that posts a Date In and a Date Out to another form. The variables are datein and dateout in format mm/dd/yyyy Trying to use this function to calculate number of nights :

Code:
<SCRIPT LANGUAGE=javascript>
<!--
function DateDifference()
{
date1= Date.parse(form.datein.value)

[Code]...

## Calculate Age From Date Of Birth And Populate

Apr 9, 2010

I have a form where we are capturing the Members Children information. I want to insert age in years to a field within this table by calculating age from Date of Birth (DOB). DOB format is mm/dd/yyyy and is a datetime data type in SQL. The DOB is added by the member while registering their child. Is there an onchange script that I could use here.

Is it possible to auto populate a field from an other field within the same form? Does anyone have any code samples that I could use?

## List Box Durations To Calculate Date?

Jan 5, 2011

If you take a look at the attached image you will see that the person has the choice of picking a membership duration of 3 months, 6 months, or One Year.The Membership Begin date automatically calculates today's date. I want to be able to have the Membership Ends field correctly give the membership ending date based on what Duration is chosen.Ex. 1/05/11 + 3 Months = 4/05/11Problem: The membership for One Year is value set for 11 because of a discount. I need to add one month to make the date correct.

## Calculate Future Date From Two Fields

Nov 26, 2011

I have a form where I have to calculate a future date (end date) from two fields. First the start date and then the number of months. So if the start date is 1/1/2011 and the months given is 12 then the end date should return as 12/31/2011. I can't figure out why it's not returnign a value.

## Calculate The Number Of Days Between Two Dates?

Sep 28, 2010

I want to calculate the number of days between two dates.

Date is in the below format:
First Date : 2010-09-27 05:00:00
Second Date : 2010-10-1 08:00:00

## How To Find / Calculate Average Number

Feb 1, 2010

I need to find the average number in javascript. It is the only bit of javascript that I have to do in the course but it carries a high mark of which I cannot afford to lose. Any way the question is : "Write code to calculate the average height and write it out in the browser window"

<SCRIPT LANGUAGE = "JavaScript">
//Experimental results of Table 1 stored in arrays.
var Height = [15,16,17,18,19];
var Number = [2,1,6,4,2];

//Part (ii).
//Write code to declare and initialise new array to represent the third row of the table.
var avg = new Array(5)
var avg = ["60","80","187","180","114"] ;
avg = "60";
avg = "80";
avg = "187";
avg = "180";
avg = "114";
//Part (iv).
//Write code to calculate the average height and write it out in the browser window.
avg = 0;
for (var count = 1; count <= 5; count = count + 1)
Array.average = function(){
var avg = 0;
for(var a = 0; a < this.length; a++){
avg += this[a];
} return avg / this.length;
};

document.write('average height is ' +avg + '<br>');
</BODY></HTML>

## Counter (up) From A Preset Number And Date To A Second Preset Number And Date?

May 10, 2011

I am delving into the coding world and while I understand the basic principle of cookies, conditional statements, arrays, etc...I have looked around the web and this forum with little success. If the situation below is too complicated, I would really appreciate even a shove in the right direction regarding the logic.How could I show a preset counter which counts up from a preset, beginning number toward a preset, end number? I imagine the increment and speed is set be the difference between the two numbers and a timeframe.

:confused: Assumptions:I would rather not set the increment but edit the end number to show a steady increase. As I update that number, the increment adapts dynamically. I would want the number/script to be useful, so it should not refresh to the beginning number on each page load (i.e. num=0). When a visitor comes to the page, it must seem like the counter has been steadily been increasing in their absence.Coke or Pesi did something similar one time regarding cans sold to date (doubt it was plugged into a DB somewhere but rather based on a steady sales figure) and it was pretty cool.

## Calculate Number Of Weeks Between Two Selected Dates

Oct 25, 2010

I am new to Java scripts. But at my job, my boss asks me to come up with a calculator that calculates the number of weeks on our website. But I want two calenders where in the first one the user will select the start date and in the second one, the user will select the end date. And There will be one last button that says"calculate" and a text box to display the number of weeks.

## Program - User Must Enter Number Of Books And Price And Then Calculate The Total Cost Of Items

May 4, 2011

I have a program in which a user must enter number of books and price and then calculate the total cost of the items, i have tried and tried to get it working to no effect can anyone see where i have went wrong.

## Code For Window.confirm() Function - Find The Number Of Days - Calculate And Display The Total Cost?

Dec 6, 2010

I am having some difficulty in constructing a window.confirm() function that works with my code.So if the form data is valid, I need to use a window.confirm() dialog box to show the user's total cost based on the rental rate of equipment chosen and the reservation period. The user must accept the cost by pressing the confirm button, and if user cancels do not submit data.I have written this code but cannot figure out how to find the number of days from the 2 date fields and use that to calculate and display the total cost.

//confirm submit and display rental cost
var equip = document.forms.equipment.value
var pDate = document.forms.pickupDate.value[code].....

## Getting Day Number Of Week From Dynamic Date

Jul 10, 2010

I want to get the day number of the week from a dynamic date such as 2010-09-25. The Objects to use are clear but not the input they accept
var d=new Date();
var dd=d.getDay();
But this retaurn the week day number of the current day. So how can I feed Date() with above date?

## Adding Function Number By Date?

Dec 7, 2010

I am working on an HTML project that displays a field with a number in the field by each day. What it does is start at 0 on day one. Each day it adds a 1 to the field. Day 2, the field would say 1, then day 3 would say 2, and so on. I am not sure how to approach this. This is also displayed in an HTML format. I want to to be automatic and change as the date changesI will also need a way to reset it back to zero if possible.

## Converting Number To Date Format?

Jan 20, 2011

how to approach this but I have a date input that uses a jQuery pop-up for a calendar, and enters the date in a format d MMM yy (1 Jan 11).

Not everyone wants to be clicking and choosing the date from the calendar but to be entering it just as a number such as 0101, 010111 or 01012011 which can be faster. This would then need to be converted to the d MMM yy format as per the jQuery pop-up when they exit the input box.

So really only if it's a number format it needs to look at the number of digits... and does the conversion.

Has anyone done something like this before? Or is there a link to how I could go about achieving this?

## Determine Whether Two Time Ranges Overlap?

Oct 7, 2011

When it occurred to me that I needed to calculate this, I knew it was over my head. (although I did come up with what I thought to be a pretty clever solution involving a very complex series of arrays...) So I decided to google it. The trouble is, the solution was a little over my head too... So I hacked away at it for about an hour, and finally it worked, but on closer inspection I had made a typo from the original algorithm.

Is the original algorithm correct, or flawed? is my interpretation correct/flawed, or the same? I'm not really sure what I did here, but after many tests, I think I got the correct solution.

original post on [URL] Let CondA Mean DateRange A Completely After DateRange B (True if StartA > EndB) Let CondB Mean DateRange A Completely Before DateRange B (True if EndA < StartB)

Then Overlap exists if Neither A Nor B is true ( If one range is neither completely after the other, nor completely before the other, then they must overlap)

Now deMorgan's law, I think it is, says that

Not (A Or B) <=> Not A And Not B

Which means (StartA <= EndB) And (EndA >= StartB)

NOTE: This includes conditions where the edges overlap exactly. If you wish to exclude that, change the >= operators to >, and <= to <

And finally the test scenario that I finally got to work:

<input onclick="this.value=''" onkeyup="TEST()" id=inhour1 value=1>
<input onclick="this.value=''" onkeyup="TEST()" id=inminute1 value=1>
<br />
<input onclick="this.value=''" onkeyup="TEST()" id=outhour1 value=2>

[Code]....

## Date Format - Function To Add Number Of Days

Aug 9, 2011

I need date format of some javascript code I'm using.
Here's the code:
<script language="javascript" type="text/javascript">
function to add number of days (accepts number of days to add)
var thisDate = new Date();
thisDate.setDate(thisDate.getDate() + days);
return thisDate;
</script>
This is what I get: Thu Aug 09 2012 16:45:34 GMT-0500 (CDT)
I just want: Aug 09 2012

## Count Number Of Sunday From A Given Date To Today?

Mar 4, 2011

counting the number of Sundays from a given date to todays date?For example the given date is 11/27/2010, so how many Sundays from then til today?

## JQuery :: Append Months Short Type With Datepicker?

Aug 16, 2010

i m trying to append months short type with jQuery Datepicker

Code JavaScript:
<script type="text/javascript">
\$(function() {

[code]...

## JQuery :: Changing Datepicker's Date Format Of Selected Date From Date Picker

Mar 16, 2011

I am having difficulty trying to change the format of selected date from date picker. This is a test so my code is very simple. Here it is.

[Code]....