Adjusting For Timezone

Aug 30, 2005

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

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):


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.

I've already split the Timezone information: I've got indiviual access to
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?

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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 ?

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Jul 11, 2009

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Jul 20, 2005

I have date(ex., Thu, 04 Dec 2003 10:35:19 +0500) and I know the
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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?

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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.

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Jul 13, 2010

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


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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
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May 21, 2010

I have my code php like that:
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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
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">
Type the time:<input name="txttime" type="text" id="txttime" value="<?php echo ShowTime(); ?>" size="5" maxlength="5">
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>

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.

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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();


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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.

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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) {
$("#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'});

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I'd like to adjust a numeric form input field by buttons, i.e. clicking the +1 button increase the numeric value in the field by one, clicking -1 does the reverse. I'll probably use <a> or <button> elements for the +1/-1.

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Apr 16, 2010

I have a large Select box for all the accounting items in the program. It's long so it makes it hard for the user to find the one they want. There are 6 categories that the accounts are in. They are:



In an attempt to simplify the selected process I put in a false option so the user can find their way easier. Example:

Bank loan
Fry's account

For each account the value is the ID from the table and the Name is the associated name in the table.This of course adds a count to the selectIndex for the box.I made a variable for each of those categories.


The problem is that I have to adjust the select index for that variable. Example, if a liability is selected, I would have to subtract 2 from the index.

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The below works fine for one call:

<script type="text/javascript">
function showHint(str){
if (str.length==0){


The above doesn't work and I am not sure what do about the showHint(str) as clearly I am not representing it properly in my attempt to modify the script.

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how can i make this script recognize all the elements inside <form name="example1"> by itself...with no need from my side to specify all elements like this (this,'day','month','year','hour','min')" Code:

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var winCal;
var dtToday;
var Cal;
var MonthName;
var WeekDayName1;
var WeekDayName2;
var exDateTime;//Existing Date and Time
var selDate;//selected date. version 1.7
var calSpanID = "calBorder"; // span ID
var domStyle=null; // span DOM object with style
var cnLeft="0";//left coordinate of calendar span
var cnTop="0";//top coordinate of calendar span
var xpos=0; // mouse x position
var ypos=0; // mouse y position
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var CalWidth=208;// calendar width
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var TimeMode=24;// TimeMode value. 12 or 24
var StartYear =2010; //First Year in drop down year selection
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