Javascript Date Subtractor
Jun 7, 2006
I have a date function that subtract a certain amount of days from todays date.
Code:
function printDate(offset)
{
var offsetAmount= offset
var currentTime= new Date()
var month= currentTime.getMonth() + 1
var day= currentTime.getDate()
var nDay= day - offsetAmount
var year= currentTime.getFullYear()
document.write(nDay + "/" + month + "/" + year)
}
I need it to be able to recognise when it goes into a previous month (ie instead of 0/6/2006 it will go to 31/5/2006)
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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]....
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Feb 8, 2003
Recently while messing with dates, I noticed an odd quirk in javascript with new Date(), i.e. if someone enters an invalid date, such as 2/29/2003, javascript creates the new date as 3/1/2003.
Having a look around, I couldn't find any scripts that took advantage of this for the sake of date validation... probably someone here has done this before, but I'll post it anyway.
The idea is that if javascript creates a new Date() with a different month, then obviously the date entered is not valid. Most of the scripts I saw used some math to divide by leap year, yadda yadda yadda, but with this feature (?) of javascript, it seems unnecessary.
Right now this code only validates mm/dd/yyyy, but it should be easy to modify to support other formats:
function isDate(sDate) {
var re = /^d{1,2}/d{1,2}/d{4}$/
if (re.test(sDate)) {
var dArr = sDate.split("/");
var d = new Date(sDate);
return d.getMonth() + 1 == dArr[0] && d.getDate() == dArr[1] && d.getFullYear() == dArr[2];
}
else {
return false;
}
}
Here's a shorter version that works if you pass in the values separately:
function isDate(mm,dd,yyyy) {
var d = new Date(mm + "/" + dd + "/" + yyyy);
return d.getMonth() + 1 == mm && d.getDate() == dd && d.getFullYear() == yyyy;
}
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Nov 15, 2005
I have written a javascript to compare current date with the date that user has entered in the form. the user enters in YYYY-MM-DD format. here'z the code:
var today= new Date();
var stDate= new Date(document.form[0].startDate.value);
var day=0; var month=0; var year=0;
var todayStr;
day= today.getDate();
month= today.getMonth()+1;
year= today.getFullYear();
todayStr= new Date(year + "-" + month + "-" + day);
alert(todayStr);
if(todayStr>stDate)
{ alert("Current date is greater");}
but todayStr gives NaN . and comparison gives no result.
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May 14, 2006
I am trying to use javascript code so that on loading of a webpage, the page displays the day, date, month and year words. So far I have come up with the following but it doesnt seem to be working: Code:
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Oct 23, 2001
Im trying to validate my date textbox on my form to only allow mm/dd/yy. If the user enters anything else in I want it to display an error message and focus on the date textbox. Ive looked at many sample scripts with no luck. Anyone out there done this before, and possibly still have the code?
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Jun 14, 2007
Is there any function in JavaScript which validates the date format like isNaN() for numbers? Or have anyone made such function which validates the date entered in the text box i.e. dd-mm-yyyy or yyyy-mm-dd or mm-dd-yyyy or dd/mm/yyy or mm/dd/yyyy or yyyy/mm/dd are only the valid dates??
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Feb 6, 2010
I have a start date and end date text boxs. What I would like to achieve is when a submit button is clicked all the available dates between start and end dates should be displayed together with 3 check boxes next to each date (please see below). I am just wondering whether that'sachievablewith jquery, and if so, how I might be able to implement this.
Start date End date
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Dec 6, 2005
I just noticed that all my javascript months are off by one month.....didn't test multiple systems tho and my system date is fine.
Any way of fixing this?
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Mar 28, 2007
I'm looking to return DATE ONLY for yesterday's date. No seconds,
milliseconds. Formatted either yyyy/mm/dd or mm/dd/yyyy. VB does it so
easily Date()-1 will return 03/27/2007 if today is 03/28/2007. Why so
many hoops for javascript? Any ideas?
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May 7, 2007
Apparently, ` new Date() ` reads it correctly, though problems
can occur if the browser returns only two digits for the year.
In particular, time zone, field order and separators may vary.
It is also reliant on the server's clock having been correctly
set at the time of upload. See the URL below.
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Dec 7, 2002
Okay, this an attempt to port PHP's date() function as much as possible to JavaScript. Could use some refactoring though. Any critique, comments, appraisal and any other opinion is very welcome. Feel free to discuss and also take a look at beetles code here: http://www.codingforums.com/showthread.php?s=&threadid=11069
Oh, and the date() function is described here: http://www.php.net/manual/en/function.date.php
Date.prototype.monthNames = new Array(
"January", "February", "March", "April",
"May", "June", "July", "August",
"September", "October", "November", "December"
);
Date.prototype.dayNames = new Array(
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"
);
Date.prototype.format = function (formatStr) {
var heap = formatStr.split("");
var resHeap = new Array(heap.length);
var escapeChar = ""; // you can change this to something different, but
// don't use a character that has a formatting meaning,
// unless you want to disable it's functionality
// go through array and extract identifiers from its fields
for (var i = 0; i < heap.length; i++) {
switch(heap[i]) {
case escapeChar:
resHeap[i] = heap[i+1];
i++;
break;
case "a": // "am" or "pm"
var temp = this.getHours();
resHeap[i] = (temp < 12) ? "am" : "pm";
break;
case "A": // "AM" or "PM"
var temp = this.getHours();
resHeap[i] = (temp < 12) ? "AM" : "PM";
break;
case "d": // day of the month, 2 digits with leading zeros; i.e. "01" to "31"
var temp = String(this.getDate());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;
break;
case "D": // day of the week, textual, 3 letters; i.e. "Fri"
var temp = this.dayNames[this.getDay()];
resHeap[i] = temp.substring(0, 3);
break;
case "F": // month, textual, long; i.e. "January"
resHeap[i] = this.monthNames[this.getMonth()];
break;
case "g": // hour, 12-hour format without leading zeros; i.e. "1" to "12"
var temp = this.getHours();
resHeap[i] = (temp <= 12) ? temp : (temp - 12);
break;
case "G": // hour, 24-hour format without leading zeros; i.e. "0" to "23"
resHeap[i] = String(this.getHours());
break;
case "h": // hour, 12-hour format; i.e. "01" to "12"
var temp = String(this.getHours());
temp = (temp <= 12) ? temp : (temp - 12);
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;
break;
case "H": // hour, 24-hour format; i.e. "00" to "23"
var temp = String(this.getHours());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;
break;
case "i": // minutes; i.e. "00" to "59"
var temp = String(this.getMinutes());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;
break;
case "I": // "1" if Daylight Savings Time, "0" otherwise. Works only on the northern hemisphere
var firstDay = new Date(this.getFullYear(), 0, 1);
resHeap[i] = (this.getTimezoneOffset() != firstDay.getTimezoneOffset()) ? (1) : (0);
break;
case "J": // day of the month without leading zeros; i.e. "1" to "31"
resHeap[i] = this.getDate();
break;
case "l": // day of the week, textual, long; i.e. "Friday"
resHeap[i] = this.dayNames[this.getDay()];
break;
case "L": // boolean for whether it is a leap year; i.e. "0" or "1"
resHeap[i] = (this.getFullYear() % 4) ? false : true;
break;
case "m": // month; i.e. "01" to "12"
var temp = String(this.getMonth() + 1);
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;
break;
case "M": // month, textual, 3 letters; i.e. "Jan"
resHeap[i] = this.monthNames[this.getMonth()];
break;
case "n": // month without leading zeros; i.e. "1" to "12"
resHeap[i] = this.getMonth() + 1;
break;
case "O": // Difference to Greenwich time in hours; i.e. "+0200"
var minZone = this.getTimezoneOffset();
var mins = minZone % 60;
var hour = String(((minZone - mins) / 60) * -1);
if (hour.charAt(0) != "-") {
hour = "+" + hour;
}
hour = (hour.length == 3) ? (hour) : (hour.replace(/([+-])(d)/, "$1" + 0 + "$2"));
resHeap[i] = hour + mins + "0";
break;
case "r": // RFC 822 formatted date; e.g. "Thu, 21 Dec 2000 16:01:07 +0200"
var dayName = this.dayNames[this.getDay()].substr(0, 3);
var monthName = this.monthNames[this.getMonth()].substr(0, 3);
resHeap[i] = dayName + ", " + this.getDate() + " " + monthName + this.format(" Y H:i:s O");
break;
case "s": // seconds; i.e. "00" to "59"
var temp = String(this.getSeconds());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;
break;
case "S": // English ordinal suffix for the day of the month, 2 characters; i.e. "st", "nd", "rd" or "th"
var temp = this.getDate();
var suffixes = ["st", "nd", "rd"];
var suffix = "";
if (temp >= 11 && temp <= 13) {
resHeap[i] = "th";
} else {
resHeap[i] = (suffix = suffixes[String(temp).substr(-1) - 1]) ? (suffix) : ("th");
}
break;
case "t": // number of days in the given month; i.e. "28" to "31"
resHeap[i] = this.getDay();
break;
/*
* T: Not implemented
*/
case "U": // seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)
// remember that this does not return milisecs!
resHeap[i] = Math.floor(this.getTime() / 1000);
break;
case "w": // day of the week, numeric, i.e. "0" (Sunday) to "6" (Saturday)
resHeap[i] = this.getDay();
break;
case "W": // ISO-8601 week number of year, weeks starting on Monday
var startOfYear = new Date(this.getFullYear(), 0, 1, 0, 0, 0, 0);
var firstDay = startOfYear.getDay() - 1;
if (firstDay < 0) {
firstDay = 6;
}
var firstMonday = Date.UTC(this.getFullYear(), 0, 8 - firstDay);
var thisDay = Date.UTC(this.getFullYear(), this.getMonth(), this.getDate());
resHeap[i] = Math.floor((thisDay - firstMonday) / (1000 * 60 * 60 * 24 * 7)) + 2;
break;
case "y": // year, 2 digits; i.e. "99"
resHeap[i] = String(this.getFullYear()).substring(2);
break;
case "Y": // year, 4 digits; i.e. "1999"
resHeap[i] = this.getFullYear();
break;
case "z": // day of the year; i.e. "0" to "365"
var firstDay = Date.UTC(this.getFullYear(), 0, 0);
var thisDay = Date.UTC(this.getFullYear(), this.getMonth(), this.getDate());
resHeap[i] = Math.floor((thisDay - firstDay) / (1000 * 60 * 60 * 24));
break;
case "Z": // timezone offset in seconds (i.e. "-43200" to "43200").
resHeap[i] = this.getTimezoneOffset() * 60;
break;
default:
resHeap[i] = heap[i];
}
}
// return joined array
return resHeap.join("");
}
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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?
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Jul 23, 2005
I've browsed through past usenet archives, but can't seem to come across quite the javascript I'm looking for. I'm looking for a simple javascript that will display the date as such:
May 17
So basically, just displaying the current month and the current date. But I would also like the ability to backdate by one day, two days, etc.. So the next date might look as such:
May 15
Which would be two days earlier than today's date, but in keeping with the same format.
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Jun 19, 2006
I'm really sorry to post this as I know it must have been asked
countless times before, but I can't find an answer anywhere.
Does anyone have a snippet of JavaScript code I could borrow which
calculated the difference in years and days between two dates, and
takes leap years into account?
I'm calculating the difference in the usual way, i.e....
var difference = dateTo.getTime() - dateFrom.getTime();
....and converting this millisecond value into days by using...
var daysDifference = (difference/1000/60/60/24);
But how do I then display the difference in days AND years? I've tried
the following:
var yearsDifference = Math.floor(daysDifference/365.25);
var daysLeft = Math.floor(daysDifference-(yearsDifference*365.25));
....but it gives me inaccuracies. For example, if I use my code to
calculate the difference between 05/01/1998 and 05/01/2000 it returns 1
year and 364 days!
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Feb 14, 2011
I have added a booking form to a website with belongs to fastbooking.You can see a temporary website here. http:[url]....It works perfectly fine in Mozilla Firefox, Google Chrome, Opera and Safari but it does not load on Internet Explorer.On the other browsers the form loads todays date and the year is generated but on IE the date stays on 01-01 and no year is generated.I'm using wordpress as a cms.I think the code that is not loading is <body onLoad='start();'>But I'm not sure. The code of the year is
<select name='fromyear' class="input" onChange='update_departure();'>
<option value="0"></option>
</select> But since it's no just the year I assume its the onload code.
I tried to add the onload to the header function like this
<body onLoad='start();' <?php if(function_exists('body_class')) body_class(); ?>>
So now wordpress generates the following code when it loads the page
<body onLoad='start();' class="home page page-id-6 page-template page-template-default logged-in">
But sadly the date still does no load on Internet Explorer.
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Aug 31, 2009
I am trying to use the jquey datepicker. I want to show the date chosen by the user in a <span> element with a particular format. However my code maintains the default format. What am I doing wrong?
[Code]..
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May 26, 2011
We have a little callendar on our website. I have set the format of the date to "dd-mm-y" because I want the date to be saved europian, not american. When comfirming the form, the date is saved as 0000-00-00. The date shows correctly on the form itself. I have two scripts: Calendar.js and Calendar-en-GB.js. Calendar-en-GB.js contains the 'settings'. (Including date format). I can't figure out the problem and thought maybe one of you could. I have uploaded the scripts in one .zip file: [URL]
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Sep 9, 2010
I want to change date format to insert date in mysql. I tried as below code
<script type="text/javascript">
$(function() {
$("#datepicker").formatDate('yyyy-mm-dd');
$("#datepicker").datepicker();
});
</script>
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Aug 5, 2010
I have a problem setting the default date of my jquery datepicker to the date that I retrieved from my database. I'm currently using the jquery datepicker linked to selects/ drop downs. I auto-fill my selects (month, day, year) from an external javascript. (fbDateTime.js)
[Code]...
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Mar 3, 2011
I want to display the alert when user enters the time less than the system time and date should be current date and if the date is greater than current date it should ignore the alert box. Here is the code
<script type="text/javascript">
function check() {
var now = new Date(),
timeParts = document.contact_form.time.value.split(':'),
[Code]....
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Oct 14, 2008
Can anybody give me complete code and steps wherein i can implement the dtpicker in only "yyyy-mm-dd" format. i want the user to select the date using this dtpicker and the selected date should show in the textbox on the form.
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Aug 19, 2009
My question is.. I have one text box there user types the date as follows (d-m-yy) 5-4-09 or 15-3-94 how can i convert them into exact (dd-mm-yyyy) 05-04-2009 or 15-03-1994 is there any 'javascript' code to convert the given date into my desired formt...
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Jul 23, 2005
Say I put a date and time for like this: Jun-15-04 21:52:06. Here is the form I am using:
<form>
<p><input type="text" name="T1" size="20"><br>
date</p>
<p><input type="text" name="T2" size="20"><br>
90 days from date</p>
<p><input type="submit" value="Submit" name="B1"></p>
</form>
How could I get to show the date 90 days later to the exact date and time. I would enter the data in the first box and hit submit to show in the second box.
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May 10, 2010
I'd like to insert a date on a webpage in the following format: Monday, May 10, 2010 However, I want to be able to set the date 6 days before the current date. So, if today's date is Monday, May 10, 2010, I want it to instead display the following: Tuesday, May 4, 2010
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Jul 8, 2010
I've inherited a Form which calculates a future date based on a calculation and then inserts today's date and the future date into a database. The day part of the date is formatted as a number. This is fine, but up to 9 the numbers display in single figures with no leading zeros. I want them to display leading zeros (e.g. 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11... 30, 31) So;
1/12/2010 is NOT wanted
01/12/2010 IS wanted
The inherited code originally set the Month names as "Jan", "Feb" etc, and it was easy to kludge these to 01, 02... 12, but I suspect there's a more elgant solution to this as well, this bit of the code works so it's not as vital to neaten this but my database needs dd/mm/yyyy format (it's a third party email program).
</script>
<script type="text/javascript">
var todaysDate = new Date();
function updateExpiryDate(){
[code].....
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