JavaScript anomaly on the number of days between two dates

Use ApEx 4.0, I found an anomaly in a javascript code that calculates the number of days between two dates, the current_date and the past_date. If the past and present is the or before March 10, 2013, and the current_date lies between 10 March 2013 and November 3, 2013, the number of days will be from 1 day to less than the actual number. Between November 3, 2013 and on 4 November 2013, the increments of number by 2, then the count will be accurate from this date forward.

Here are some examples:

March 10, 2013 = 69 days of December 31, 2012
March 11, 2013 = 69 days of December 31, 2012
March 12, 2013 = 70 days of December 31, 2012

November 3, 2013 = 306 days in December 31, 2012
November 4, 2013 = 308 days in December 31, 2012

11 March should be 70 and 12 March should be 71. November 3 is 307 and 4 November corrects the number of fake, which began March 11.

Change the past_date to March 10, 2013 produces the following:

March 10, 2013 = 0 days of March 10, 2013
March 11, 2013 = 0 days of March 10, 2013
March 12, 2013 = 1 days of March 10, 2013

But change the past_date to 11 March 2013, product of the correct numbers:

March 11, 2013 = 0 days of March 11, 2013
March 12, 2013 = 1 days of March 11, 2013
March 13, 2013 = 2 days of March 11, 2013

I would certainly all help to determine the cause of this anomaly. Here's the javascript code:

var w1 = ($v ("P48_PAST_DATE"));
W1 = (w1.toString ());
vmon var = (w1.substr (3.3));
vyr var = (w1.substr (7));
var r = (vyr.length);
If (r == 2)
vyr. = (parseFloat (vyr) + 2000);
vday var = (w1.substr (0.2));
var y = (vmon.concat ("", vday, ",", vyr));
y = Date.parse (y);

var w2 = ($v ("P48_CURRENT_DATE"));
var vmon2 = (w2.substr (3.3));
var vyr2 = (w2.substr (7));
var vday2 = (w2.substr (0.2));
var x = (vmon2.concat ("", vday2, ",", vyr2));
x = Date.parse (x);

var numdays = (x - y);
numdays = (Math.floor(numdays / 86400000));
$s ("P48_NUMBEROFDAYS", numdays);

Did you google for something like "javascript number of days between two dates. I think you will find the explanation to this observation:

This method does not work correctly if there is an advanced economies jump between the two dates.

There are examples available to calculate the difference between two dates.

Tags: Database

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