# Add Or Subtract From The Numeric Value Of Hour[0] Based On Timezone

Oct 15, 2009

Take a variable...

var time = "12:00"
split it...
var hour=time.split(":");

...then add or subtract from the numeric value of hour[0] based on timezone.

EST = -5
PST = -8

What would be the best way of doing this?

## Validating Hour Of The Day Is Numeric And Less Than 24 And Bigger Than 0?

Jul 30, 2011

The code bellow validates an number is between 0 and 59.I want to modify the code to make another function which validates an entered value is numeric and between 0 and 24 (for the hour of the day).Since sorry i did not understand the function bellow, can some one pls help me understand it or guide me for creating a similar function which validates the entered hour of the day is between 0 and 24?

function isBetween_0_59(evt, ctrl) {
var result = isNumberKey(evt);
if (result) {[code]........

## Load Image Based On Hour?

Jan 22, 2008

I am trying to create a script that will load an image based upon the hour of the day... Ultimately, the script needs to function as follows:

- A user navigates to the URL
- An image is displayed that is 2 hours old

I have a camaera/utility to upload my image files by hour and updated every 10 minutes. So I have 24 images with a consistent name based upon the hour they where captured (e.g. 12.jpg, 13.jpg, etc...).

Therefore, all I need it a script that will determine what the current hour and display the image that corresponds to two hours previous. I know I can use the javascript math functions to get the 2 hour delay, but it's actually outputting the images that I'm having difficulty with.

I'm thinking I need to use the javascript "Switch" function, similar to the following, but I just can't seem to figure out how to make the script output an image instead of text. Code:

## Stop 24 Hour Clock Continuing Past 24th Hour?

Mar 29, 2010

I have a webpage with a world clock. On the clock page are 12 buttons (World Cities). When the user clicks these buttons. The time for the relevant world city is displayed. (The time is updated by an on.click function for each individual button. That either subtracts or adds the hours from GMT. For example. If the time is GMT 18:00:00. The user clicks the Paris button and the function adds 1 hour to result in 19:00:00)

However. If the GMT time is for example 21:00:00 and the user clicks the Tokyo button (GMT+9 hours). The time displayed is 30:00:00. So I have been trying to work out how I can stop the time adding past 23:59:59.

[Code]...

Aug 30, 2005

I'm (still) working on an ISO 8601 date parser. I want to convert at least
the formats described here:

http://www.w3.org/TR/NOTE-datetime

Well.. I've got most of it working (via RegEx's) good enough for me but I'm
having a brain block when it comes to TimeZone.

The datetime may come with an optional timezone offset (from GMT) as here
(the offset is +1 hour from GMT):

1997-07-16T19:20:30+01:00

So... that's the current time there... but my spec is that timezone
information, if present, should be used to convert the given time to local
time. For me, for example, this would be -5:00 from GMT.

the sign (plus or minus), the hour offset and the minute offset.

So I'm sure there's a nice, simple formula for this... but it eludes me. Or
I'm lazy... I can't decide which.

Any pointers?

## Get Client Local Timezone And Use It In PHP?

Sep 29, 2011

My php script has an input date (example: 2011-09-30) but if I use the server date then it may not match to client's machine.

But how do I get the client's local timezone then pass it to php and convert ?

## Showing Local Time And Timezone

Jul 11, 2009

I am building a website for users that exist around the world and need to show the user's "local machine" time and timezone, not the time of the website host server. Is there a javascript function or process to determine this?

## Subtract Using Random Arrays

Jun 12, 2006

Heres my most current code. I have it where, onClick on an image it calls this. and it works, but the hp keeps restarting, like they all minus from 100, instead of the number that prieviously minused from 100. For xp: 100-9=91, is the first, the second, 100-72=28 instead of 91-72. How do i fix

var myhp;
function takehits()
{
var dmg= new Array()
dmg[0]=9;
dmg[1]=11;
dmg[2]=15;
dmg[3]=21;
dmg[4]=29;

myhp=100;
var rndtake=Math.floor(Math.random()*5);

document.getElementById('health').innerHTML=myhp-dmg[rndtake];
}
I want to have it where, you have an aray, and u have a number value that you want the number value, to be subtracted by one of the numbers in the array. And u lets say the array has 5 choices. Code:

## Javascript For Converting Given Date To The Required Timezone

Jul 20, 2005

I have date(ex., Thu, 04 Dec 2003 10:35:19 +0500) and I know the
timezone(ex., America/Anchorage). Now I need to convert the date into
the given timezone. Is it possible to achieve this thru js api's?

## Populate Time On Basis Of Timezone Difference?

Oct 27, 2009

I am working on date time picker modification. I am copying the time from one source pasting in text box and then once I click on another box. It populates the time on the basis of time zone difference. Now whenever I am doing vice versa. It is going in loop.

## Set To Apply To A Certain Timezone Not Users Computer Time?

Jul 13, 2010

I was wondering if I could set the script below to apply to eastern standard time and not the users computer time. So it wont confuse users over seas, Im using it to display scheduled announcements as the header.

<script type="text/javascript">
var d = new Date();
theDay=d.getDay();

[code]....

## Subtract A Day To Date Object Using 'myDate - 1'

May 29, 2007

Am i breaking any rules when I loop dates like

// Determine Memorial Day
intFlag = 0;
memDayHol = new Date (currentYear, 4, 31);
while (intFlag == 0) {
if (memDayHol.getDay() == 1) {intFlag =1;}
else {memDayHol = memDayHol - 1;}
}

I can find no docs that one can use the '+' operator directly on a date
object, and it assumes adding/subtracting a day(s). Is this deprecated
code?

## How To Auto Subtract Two Text Values

Mar 16, 2011

I am trying to change the script below from adding the values to subtracting without much luck.
Code:
<script type="text/javascript" language="javascript">
function autocalc(oText) {
if (isNaN(oText.value)) //filter input {
oText.value = '';
} var field, val, oForm = oText.form, netincome = a = 0;
for (a; a < arguments.length; ++a) //loop through text elements {
field = arguments[a];
val = parseFloat(field.value); //get value
if (!isNaN(val)) //number? {
netincome += val; //accumulate
}}
oForm.netincome.value = netincome; //out
}
</script>

## Subtract N Days From Current Date?

Nov 10, 2010

I have the following function that will subtract n number of days from todays date. The problem is that it always returns the the wrong calculate date. The month is wrong.

see if you can spot my mistake:

Code:

function returnDate(ndays){
var dayOfTheWeek = now.getDay();
now.setTime(now.getTime() - nDays * 24 * 60 * 60 * 1000);
alet(now.getYear() + "/"+now.getMonth()+"/"+now.getDate()) // returns new calculated date
}

## Display Clients Timezone Name When In Daylight Savings Time

Jul 23, 2005

ok im getting tired of looking for an answer and coming up short with
scripts that dont work. i have a application that uses GMT for all its
times and needs the clients timeoffset for showing the correct times
for everything. i use date.getTimezoneOffset() which works fine and
shows the daylight savings time correct value of -4 since im in eastern
standard time and its daylight savings time right now. well eastern
standard time is normally -5 and my dropdown populates with the -4
showing atlanta time. which will confuse the user and then they will
pick -5 eastern time which will make everything an hour off. i have a
disclaimer now, but i just want to know what the easiest way to display
the users time zone name useing the getTimezoneOffset() value. i
really want to be able to detect if the user has the adjust for
daylight savings checked for their machine.

## JQuery :: Timezone - Get Data From System And Return In EU Format

May 21, 2010

I have my code php like that:
<?php
//Get the data from system and return in EU format
function ShowDate() {
\$Date = date("d"."/"."m"."/"."Y");
return \$Date;
}
//Get the time from system
function ShowTime() {
\$Time = date("H".":"."i");
return \$Time;
}
?>

Now I have two input box
<html>
<body>
Type the date:<input name="txtdate" type="text" class="input" id="txtdate" title="e.g dd/mm/yyyy" value="<?php echo ShowDate(); ?>" size="9" maxlength="10">
<br>
Type the time:<input name="txttime" type="text" id="txttime" value="<?php echo ShowTime(); ?>" size="5" maxlength="5">
<br>
London: Friday May 21 2010 05:12:00 <br>
New York: Friday May 21 2010 00:12:00<br>
Hong Kong: Friday May 21 2010 12:12:00<br>
Tokyo: Friday May 21 2010 13:12:00<br>
</body>
</html>

So.... the important is the user can interactive with the date. If I change the date or time all this values will be change as well. Someone knows how can I do this? The field txtdate I will get from a calendar plugin (javascript) that I already put in my code.

## Create Own Script That Gets The Time, Checks The Timezone And Converts It To MST?

Jul 13, 2011

First off let me say I did do a search of google and these forums before posting this. I have sort of what I want without having exactly what I want and before I proceed further hacking up already working code I figured I'd start a conversation as to whether my goal is at all possible.Currently using (thank you w3schools as I am by no means a javascript expert):document.writeln(new Date()) I get the following: Wed Jul 13 2011 09:24:09 GMT-0600 (Mountain Daylight Time)which would be great for most people, but I'm kind of picky so I want the clock to keep ticking and to show the current time.To do this I use this code(again thank you w3schools):

function startTime()
{
var today=new Date();

[code]....

## Timezone Milliseconds - Application Servers Are Hosted In US Central

May 5, 2009

Our application servers are hosted in US Central. So when cookie created by the application it contains US Central Time with DST.

When we use it in India time comparison logic fails as milliseconds are different. In US central logic of comparison current datetime milliseconds with cookie date time milliseconds work gr8. Any way so that It work in India too.

Feb 1, 2010

I have calendars on my site where tenants can make reservations for shared rooms. The start times are listed in a drop down starting at 8am and going through 5pm at one hour intervals. What I'd like to be able to do is make the drop down be populated 1 hour from the current time. For example, if it is 8 now, I'd like the time in the drop down to start at 9. Is this something that's possible or wishful thinking?

## How To Add One Hour To Current Time

Oct 9, 2011

suppose if user enter the pickup time as 11:00 clock and the system time is 11:15 then I want to display the pop up message

## JQuery :: Access Index Of Item And Add/subtract From It?

Jan 10, 2012

I have an image gallery where every image has an index number ("data-index"). How do I access that index number when the image is "current" and then add +1 when it's "next" or subtract -1 when it's "previous"? Below is part of my code.

[Code]...

## Setinterval - Use Local Storage To Set A Value In My Web App - Subtract A Number ?

Apr 19, 2011

What Ive done is use local storage to set a value in my web app.

Then my next task was to write said value on my page (This took me hours but finally got it done).

My next task is using Setinterval(or what ever the correct way to solve my problem) to subtract a number (lets use "1" for this example) Every 5 seconds from the local storage value.So basically After I click the button. Value is set and displayed. After another button is click. Every 5 seconds the localstorage is subtraced by 1. I think the code im looking for is similar to this

Code:

## JQuery :: Deduct / Subtract From Calculator Plugin

Jun 14, 2011

I have a calculator and using JQuery Calculator plug-in which Tally's up groups of field values using key up. I have a summary page which presents the user with over all expenditure. What I need to do is subtract the expenditure from income, populate a total field onclick of an <li>.

## JQuery :: Change Countdown Timer - Timezone Difference Added

Jan 9, 2012

I have a countdown clock in bidding. When someone bid within 30 secs clock will reset from 30 sec. In my case clock is reset but timezone difference added. So if bid within 30 sec clock counting down 4 hrs , 30 mins , 30 secs.

My code is below----
"cd".\$clock_no is the countdown div
var periods = \$("#cd". \$clock_no."").countdown('getTimes');
if (\$.countdown.periodsToSeconds(periods) < 30) {
periods[6]+=30;
\$("#cd1").countdown('change', {until: periods[0] + 'y ' + periods[1] + 'o ' + periods[2] + 'w ' + periods[3] + 'd ' + periods[4] + 'h ' + periods[5] + 'm ' + periods[6] + 's'});
}

## JQuery :: Swap Out Divs On The Top Of Every Hour?

Sep 10, 2011

I am trying to roll out a 24 hour event, where at the top of every hour one div is swapped out for another. The code I'm using is:

var rightNow = new Date();
var day = rightNow.getDay();
var hour = rightNow.getHours();

[Code].....

But, it only works with two instances of it...for two divs. If I put the code in three or more times, to swap out 3 or more divs, it doesn't work.

I'm thinking I should be able to write everything into one block of code, but can't figure it out. Any suggestions? I'm sorry to bother people with this, I just can't find any info online and I want to test it out ASAP so I know if I have to abandon the effort and try something else. I would just like to avoid having to build it in Flash too.

## JQuery :: Nutrition Calculator Subtract Link Not Working

Jan 11, 2012

I have been fighting a nutrition calculator and I finally have all the addition working. the problem is the subtract link is not working. (it works as a link but doesn't trigger my jquery).
var jM = jQuery.noConflict();
// Calculator behavior
//Create the Variables to Hold the Values for Nutrition Information.....
jM('.subtract').click(function() {