Question

Add a numeric value from text box to a date to put date into future

Asked by: MaxwellTurner

I want to add a number from a textbox, add it to today's date\time, and dsiplay the newdate\time (sometime in the future) in another textbox.  My problem:  the number from the textbox dosen't mathematically 'add' to the date - see examples below:

Textbox1 - name='adate' - this should display today's date/time with the value of Textbox2 added to it
Textbox2  - name='howmanydays', value=5

Using the textbox value of 5 above, if today's date is 11/2/2008, the new date (adate) SHOULD BE 11/7/2008, but what it does is 11/25/2008 - it just places the number after the exisiting day rather than adding to it.

Here is the code I am using:

function adddates2() {
var a_p = "";
var d = new Date();
var daysahead =  window.document.frmcomm.howmanydays.value; // if I use an actual number here, it all works great
var interval = daysahead;
var futuredate = new Date(d.getYear(),d.getMonth(),d.getDate()+interval);

var curr_date = futuredate.getDate();
var curr_month = futuredate.getMonth()+1;
var curr_year = futuredate.getFullYear();

var curr_hour = d.getHours();

if (curr_hour < 12)
   {
   a_p = "AM";
   }
else
   {
   a_p = "PM";
   }
if (curr_hour == 0)
   {
   curr_hour = 12;
   }
if (curr_hour > 12)
   {
   curr_hour = curr_hour - 12;
   }

if (d.getMinutes()<10)
      {
            var curr_min = '0' + d.getMinutes();
      }
else
      {
            var curr_min = d.getMinutes();
      }

if (window.document.frmcomm.howmanydays.value != "")
      {
      window.document.frmcomm.adate.value = curr_month + "/" + curr_date + "/" + curr_year + " " + curr_hour + ":" + curr_min + " " + a_p;
      }
}

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Asked On
2008-12-03 at 10:00:30ID23954104
Tags

Javascript

,

ie7

Topic

JavaScript

Participating Experts
1
Points
500
Comments
2

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Answers

 

by: GreenGhostPosted on 2008-12-03 at 10:34:51ID: 23088701

The problem is that the value from the textbox is a string. When you add it to the day, the day also gets converted to a string so that the data types match. The strings '2' and '5' gets concatenated into '25', which then gets converted to a number as the Date constructor only accepts numbers.

You just have to parse the value from the textbox into an integer:

var daysahead = parseInt(window.document.frmcomm.howmanydays.value);

                                              
1:

Select allOpen in new window

 

by: MaxwellTurnerPosted on 2008-12-03 at 11:26:59ID: 23089161

Thank-you so much!  I spent the entire day yesterday on this.  I figured that was a string issue, but just could not figure out how to convert the var into an integer.  Works wonderfully!

Max

20120131-EE-VQP-002

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