How can I check that a date is greater than or less than the specified date using javascript by passing the month and year only in MMM-YYYY Format.
For example :
Let the user selects JUL from month dropdown and 2016 from years dropdown ,
Now How can I check that the selected values are greater than / less than JUN 2016 .
I've taken the input in Session variables as session("month") , session("yrs").
I've tried the following but nothing happens :
var d1 = new Date('JUN-2016')
var d2 = new Date(<% =session("month")+"-"+session("yrs") %>) )
if(d2.getTime() > d2.getTime())
{
alert('Greater than jun 2016');
}
else
{
alert('Less than jun 2016');
}
I've gone through this link Compare two dates with JavaScript but didn't find the solution for my condition.
As this application is developed on VB so i don't have much knowledge about that.
How can I resolve this .
Please suggest
Thanks in advance.
Try this -
var x = new Date('JUN-2016');
var y = new Date('MAY-2016');
console.log(+x < +y);
console.log(+x > +y);
console.log(+x === +y);
First convert it to date object
// convert to a parseable date string:
var dateStrA = "28/12/2013 16:20:22".replace( /(\d{2})\/(\d{2})\/(\d{4})/, "$2/$1/$3");
var dateStrB = "28/12/2013 16:20:11".replace( /(\d{2})\/(\d{2})\/(\d{4})/, "$2/$1/$3");
// now you can compare them using:
new Date(dateStrA) > new Date(dateStrB);
var date1 = Math.ceil(Math.abs(first date) / (1000 * 3600 * 24));
var date2 = Math.ceil(Math.abs(second date) / (1000 * 3600 * 24));
if(date1 > date2 )
alert("date1");
else
alert("date2");
You just have to do a simple compare of dates. Please read more about "Date" here: http://www.w3schools.com/js/js_date_methods.asp
Maybe this code might help:
var day = 1; // Since you don't care about the day just use the first day
var month = session("month"); // Use the number of the month instead of the name
var year = session("yrs");
var dateJune = Date.parse("2016-07-01"); // June
var dateInput = Date.parse(year + "-" + month + "-" + day);
// Compare dates
if (dateJune > dateInput) {
// The input is before june
} else if (dateJune < dateInput) {
// The input is after june
} else {
// It is june
}
You need a valid date format to be able to parse the date. Instead of getting "JUN" from your select box it would be better to get the number of the month instead. A select box should look like this:
<select>
<option value="01">Jan</option>
<option value="02">Feb</option>
...
</select>
If this is not an option you can use a function that calculates the number for you if you know then string values that your month variable might have:
function (nameOfMonth) {
switch (nameOfMonth) {
case 'Jan':
return "01";
case 'Feb':
return "02";
....
}
}
Related
I have an interface where I receive a date in this format: Month/Year, ex: 11/2022.
I would like to verify that this is a valid date.
I use the datatables editor. The configuration (see below) of the field works well, but since the user can enter the date himself without going through the calendar, there is a risk that the date entered is incorrect. It doesn't work like an input mask. So i need to validate the date in the code.
{
type: "datetime",
label: "Date:",
name: "Date",
def: function () { return new Date(); },
format: 'MM/YYYY',
fieldInfo: 'Format: Month/Year (ex: 12/2022)',
keyInput: true
}
The date should not be accepted if the difference between this date and today's date is less than 3 months.
It means that, compared to today, all dates before July will have to be rejected.
Currently I can do this with the relativedelta method of the python dateutil module. But as the validation must be done on the client side, I would like to do this in javascript (which I know very little).
The example below shows how to do this. You should take advantage of the HTML 5 input types to validate your dates. You also need to calculate 3 months from now in myEpoch and then compare it to the date/time given
HTML:
<p>
Date & Time: <input id="foo" type="datetime-local" />
</p>
JavaScript:
var myEpoch = new Date();
myEpoch.setMonth(myEpoch.getMonth() + 3);
myEpoch = myEpoch.getTime();
var foo = document.getElementById("foo");
if (foo.value < myEpoch) {
//show a message saying this date is invalid
}
Since user is entering date in MM/yyyy format, so i'm assuming that you take 1 as a date into account, i.e., if input is 03/2020, you would consider it as: 01/03/2020. Right? If
so, then you can do the following to validate this date:-
function isValidDate(inputDate) {
// Unfortunately JS doesn't have any in-built function to validate date in MM/yyyy format. Hence regex comes to the rescue
var regex = /^([0-9]{1,2})\/([0-9]{4,4})$/;
var matches = regex.exec(inputDate);
if (!matches || matches.length != 3) {
throw new Error('Please provide date in MM/yyyy format');
}
var inputMonth = matches[1]; // Return month from input date
var inputYear = matches[2]; // Return year from input date
var finalDate = inputMonth+ '/01/' + inputYear;
// Check if entered date is valid or not
var parsedDate = Date.parse(finalDate);
if (isNaN(parsedDate)) {
throw new Error('Unable to parse date.');
}
// Check if it is less than 3 months or not.
var isValid = !isLessThan3Months(new Date(finalDate), new Date());
return isValid;
}
function isLessThan3Months(dateToCompare, currentDate) {
var diffYears = currentDate.getFullYear() - dateToCompare.getFullYear();
var diffMonths = currentDate.getMonth() - dateToCompare.getMonth();
var diffDays = currentDate.getDate() - dateToCompare.getDate();
var months = diffYears * 12 + diffMonths;
if (diffDays > 0) {
months += '.' + diffDays;
} else if (diffDays < 0) {
months--;
months +=
'.' +
(new Date(currentDate.getFullYear(), currentDate.getMonth(), 0).getDate() + diffDays);
}
return months < 3;
}
isValidDate('03/2020');
So now, by calling isValidDate with user's input date in MM/yyyy format, you should be able to check if it is valid or not.
For this, you won't need to use any third party javascript library. Just plain javascript is enough.
You should probably use Moment.js, because working with the raw Date object is fiddly.
If you would rather use plain JavaScript, then the following might be of use:
const moreThan3MonthsHence = ({ utcYear, utcMonth },
now = new Date,
target = new Date(Date.UTC(utcYear, utcMonth)),
threeMonthsHence = addMonths(new Date(now.valueOf()), 3)) =>
(target > threeMonthsHence)
const validate = (str,
[utcMonth, utcYear] = str.split('/'),
date = new Date(Date.UTC(+utcYear, (+utcMonth)-1))) =>
moreThan3MonthsHence({ utcYear: date.getUTCFullYear(), utcMonth: date.getUTCMonth() })
const addMonths = (date, months, d = date.getDate()) => {
date.setMonth(date.getMonth() + +months);
// If rolled over to next month, set to last day of previous month
if (date.getDate() != d) {
date.setDate(0);
}
return date;
}
// Note: input is one-based months
console.log(validate('07/2020')) // true
console.log(validate('06/2020')) // false
console.log(validate('12/2019')) // false
Notes
now is internally represented as the milliseconds since the Unix epoch. Note this includes the current time of day.
target is the milliseconds since the Unix epoch of midnight on the supplied UTC date.
threeMonthsHence is the milliseconds since the Unix epoch of now (including time of day), plus three months.
validate parses the input string.
addMonths is necessary because the built-in function can roll-over into a new month with unexpected behavior.
Finally to solve my problem I mixed the solutions proposed by #Sumit Parakh and #ControlAltDel.
function isValidDate(inputDate) {
var regex = /^([0-9]{1,2})\/([0-9]{4,4})$/;
var matches = regex.exec(inputDate);
var parsedDate = 0;
if (!matches || matches.length != 3) {
throw new Error('Please provide date in MM/yyyy format');
}
else {
var inputMonth = matches[1]; // Return month from input date
var inputYear = matches[2]; // Return year from input date
var finalDate = inputMonth+ '/01/' + inputYear;
// Check if entered date is valid or not
var parsedDate = Date.parse(finalDate);
if (isNaN(parsedDate)) {
parsedDate = 0;
//throw new Error('Unable to parse date.');
}
return parsedDate;
}
var myEpoch = new Date();
myEpoch.setMonth(myEpoch.getMonth() + 3);
myEpoch = myEpoch.getTime();
finalDate = isValidDate(date_peremption.val());
if (finalDate == 0){
date_received.error("This date is invalid");
}
else if(finalDate < myEpoch) {
date_received.error("The date must be more than three months last");
}
It's not very elegant, but it works. Thanks everyone
I am having an input date field in my form. In my date field
i need to alert an error if the input date is greater than any date i define before
here is what i code :
$(document).ready(function () {
var date = new Date(2016,2,1); //the defined date is 1 March 2016
var day = date.getDate();
var month = date.getMonth();
month = month + 1;
if(day < 10){
day = '0' + day;
}
if(month < 10){
month='0'+month;
}
someday = day + '/' + month + '/' + date.getFullYear();
$("#q1 input").blur(function(){ //#q1 is the ID for the input field.
if($('#q1 input').val() > someday){
alert('the input is bigger than the defined');
}else{
alert('the defined is bigger than the input ');
}
});
});
To compare Dates is very straight forward. Most operators coerce the operands to number, and Dates return their time value so to see if today is before or after say 1 March 2016, create two Dates and compare them:
var epoch = new Date(2016,2,1); // Create date for 2016-03-01T00:00:00
var now = new Date(); // Create a date for the current instant
now.setHours(0,0,0,0); // Set time to 00:00:00.000
if (now < epoch) {
alert('Before 1 March, 2016');
} else {
alert('On or after 1 March, 2016');
}
Or a bit more compact:
alert((now < epoch? 'Before':'On or after') + ' 1 March, 2016');
You might want to compare the values as in the date form, not the way you did.
Convert the input value into the form of date and compare it with the variable 'date'.
Compare the input date with the desired date that you defined. For example:
var d1 = new Date();
var d2 = new Date(d1);
var same = d1.getTime() === d2.getTime();
var notSame = d1.getTime() !== d2.getTime();
If you find it tricky, then there is an awesome js library called moment.js. It is very useful when playing with dates.
$(document).ready(function () {
var date=new Date(2016,2,1); //the defined date is 1 March 2016
var fixedDate = returnDate(date);// convert date in dd/mm/yyyy format
//#q1 input will search a child input inside an #q1 dom element, which probably not the case
// input#q1 will refer to input with id #q1
// You can directly query the input since it has id #q1 so #q1 input is not correct
$("#q1").blur(function(){ //#q1 is the ID for the input field.
var d2 = new Date($('#q1').val());
var inputDate = returnDate(d2); // convert input date in dd/mm/yyyy format
if(inputDate > fixedDate){ // compare two dates
console.log('the input is bigger than the defined');
}else{
console.log('the defined is bigger than the input ');
}
});
});
// Write a general function to convert date in dd/mm/yyyy format
function returnDate(date){
var day=date.getDate();
var month=date.getMonth();
month=month+1;
if(day<10){
day='0'+day;
}
if(month<10){
month='0'+month;
}
var someday=day+ '/' + month + '/' + date.getFullYear();
return someday;
}
JSFIDDLE
EDIT 1
Use ternary operator instead of if-else
inputDate > fixedDate? (console.log("the input is bigger than the defined")):(console.log("the defined is bigger than the input"))
with ternary operator
i have two input box for getting date value in the format "dd/mm/yyyy".
i have to create coupon for a shop, so i have to check 1st date should be from tomorrow.
for ex. if today is 5th sep, then 1st date should not be before 6th sep.
and 2nd date should be atleast 1day greater than the 1st date. if user entered 1st date as 10th sep, then 2nd date should not be same or before 10th sep.
so if a user enters 31st jan 2013 ( 31/01/2013) as 1st date then 2nd date can be 1st feb or any date after 1st feb. so i hvae to check the date validation also.
for date validation i am using the following code -
function chkdate(y,m,d)
{
var date = new Date(y,m-1,d);
month1 = date.getMonth()+1;
date1 =date.getDate();
if(month1 <10)
{
month1 = "0"+month1;
}
if(date1 <10)
{
date1 = "0"+date1;
}
var convertedDate =""+date.getFullYear() + (month1) + date1;
var givenDate = "" + y + m + d;
return ((givenDate==convertedDate)?true:false);
}
i am callling above function inside a function -
function generate_coupon()
{
var f_arr = from_date.split("/"); //from_date is from 1st input date value.
var f_day = f_arr[0];
var f_month =f_arr[1];
var f_year =f_arr[2];
var t_arr = to_date.split("/"); //to_date is from 2nd input date value.
var t_day = t_arr[0];
var t_month =t_arr[1];
var t_year =t_arr[2];
if (chkdate(f_year,f_month,f_day)== true && chkdate(t_year,t_month,t_day)== true)
{
}
else
{
alert('Enter Valid Date - dd/mm/yyyy');
}
}
in that if condition i have to check both date values - the 1st date value is from tomorrow or not and 2nd date value should differ from 1st date by atleast 1 day. if both conditions are true then i wil generate a coupon or else i will alert invalid date.
how should i do it ??
rather doing this type of validation, i think it will be more easy for you that you fill the other date field you self using some defined code. and made those fields UN-editable
Farid has made a good point, however if your base date is dynamic something like this should work:
function isValidInput(date1, date2) {
return date2 >= getNextDate(date1);
}
function getNextDate(date) {
// The number of milliseconds in one day
var ONE_DAY = 1000 * 60 * 60 * 24;
var date_ms = date.getTime();
var nextDate_ms = date_ms + ONE_DAY;
var nextDate = new Date(nextDate_ms);
// Make sure to get rid of time, so that it's always at 00:00:00 hour.
return new Date(nextDate.getYear(), nextDate.getMonth(), nextDate.getYear());
}
function checkDates(d1, d2) {
if (d1 instanceof Date && d2 instanceof Date) {
var today = new Date();
today.setHours(0, 0, 0, 0);
if (date1.getTime() < (today.getTime() + 86400000)) {
return "First date should be after today";
}
if (date2.getTime() < (date1.getTime() + 86400000)) {
return "Second date should be after First date";
}
return "Dates are valid";
}
return "One or more invalid date";
}
var date1Str = "6/9/2012";
var date2Str = "7/9/2012";
var date1Arr = date1Str.split("/");
var date2Arr = date2Str.split("/");
var date1 = new Date(date1Arr[2], date1Arr[1] - 1, date1Arr[0]);
var date2 = new Date(date2Arr[2], date2Arr[1] - 1, date2Arr[0]);
alert(checkDates(date1, date2));
Try this
function generate_coupon() {
var from_date = document.getElementById("fromDate");
var to_date = document.getElementById("toDate");
var from = new Date(from_date.value);
var to = new Date(to_date.value);
var today = new Date();
var tomorrow = new Date(new Date().getTime() + 24 * 60 * 60 * 1000);
if (from >= tomorrow && to > from) {
} else {
alert('Enter Valid Date - dd/mm/yyyy');
}
}
Javascript definitely isn't my strongest point. I've been attempting this for a couple of hours now and seem to be getting stuck with date formatting somewhere.
I have a form where a user selected a date (dd/mm/yyyy) and then this date will be taken and 2 weeks will be added to it and then date will be copied to another form field.
My latest attempt below isn't even adding a date yet just copying the selected date in one form field to another, if I select '03/02/2012', it outputs 'Fri Mar 02 2012 00:00:00 GMT+0000 (GMT Standard Time)', so its outputting in American format as well as the full date. How to I get it to out put in the same format and add 2 weeks?
function LicenceToOccupy(acceptCompletionDate)
{
var date1 = new Date(acceptCompletionDate);
document.frmAccept.acceptLicence.value = date1;
}
You can do this :
const numWeeks = 2;
const now = new Date();
now.setDate(now.getDate() + numWeeks * 7);
or as a function
const addWeeksToDate = (dateObj,numberOfWeeks) => {
dateObj.setDate(dateObj.getDate()+ numberOfWeeks * 7);
return dateObj;
}
const numberOfWeeks = 2
console.log(addWeeksToDate(new Date(), 2).toISOString());
You can see the fiddle here.
According to the documentation in MDN
The setDate() method sets the day of the Date object relative to the beginning of the currently set month.
This might not answer the question per se, but one can find a solution with these formulas.
6.048e+8 = 1 week in milliseconds
Date.now() = Now in milliseconds
Date.now() + 6.048e+8 = 1 week from today
Date.now() + (6.048e+8 * 2) = 2 weeks from today
new Date( Date.now() + (6.048e+8 * 2) ) = Date Object for 2 weeks from today
You're assigning date1 to be a Date object which represents the string you pass it. What you're seeing in the acceptLicense value is the toString() representation of the date object (try alert(date1.toString()) to see this).
To output as you want, you'll have to use string concatenation and the various Date methods.
var formattedDate = date1.getDate() + '/' + (date1.getMonth() + 1) + '/' + date1.getFullYear();
In terms of adding 2 weeks, you should add 14 days to the current date;
date1.setDate(date.getDate() + 14);
... this will automatically handle the month increase etc.
In the end, you'll end up with;
var date1 = new Date(acceptCompletionDate);
date1.setDate(date1.getDate() + 14);
document.frmAccept.acceptLicence.value = date1.getDate() + '/' + (date1.getMonth() + 1) + '/' + date1.getFullYear();
N.B Months in JavaScript are 0-indexed (Jan = 0, Dec = 11), hence the +1 on the month.
Edit: To address your comment, you should construct date as follows instead, as the Date argument is supposed to be "A string representing an RFC2822 or ISO 8601 date." (see here).
var segments = acceptCompletionDate.split("/");
var date1 = new Date(segments[2], segments[1], segments[0]);
This should do what you're looking for.
function LicenceToOccupy(acceptCompletionDate)
{
var date1 = new Date(acceptCompletionDate);
date1.setDate(date1.getDate() + 14);
document.frmAccept.acceptLicence.value = date1.getDate() + '/' + (date1.getMonth() + 1) + '/' + date1.getFullYear();
}
To parse the specific dd/mm/yyyy format and increment days with 14 , you can do something like split the parts, and create the date object with y/m/d given specfically. (incrementing the days right away) Providing the separator is always -, the following should work:
function LicenceToOccupy(acceptCompletionDate)
{
var parts = acceptCompletionDate.split("/");
var date1 = new Date(parts[2], (parts[1] - 1), parseInt(parts[0]) + 14); //month 0 based, day: parse to int and increment 14 (2 weeks)
document.frmAccept.acceptLicence.value = date1.toLocaleDateString(); //if the d/m/y format is the local string, otherwise some cusom formatting needs to be done
}
date1.toLocaleDateString()
Thiswill return you date1 as a String in the client convention
To create a new date date2 with 2 weeks more (2weeks = 27246060 seconds):
var date2 = new Date(date1 + 60*60*24*7*2);
I have a table to which i dynamically add rows. The number of days is equal to the date difference of the dates inserted by user. On the dynamic rows i want to add three fields. The first two are date and day filed. For that I need to know the next date and the corresponding day. For example user enters 10-2-2012. I need to insert The next dates like 17-2-2012,18-2-2012... and corresponding days like Wednesday, Thursday..etc
I have used the following function to get next date
function getTomorrow(d,offset)
{
if (!offset)
{
offset = 1
}
return new Date(new Date().setDate(d.getDate() + offset));
}
But it shows error 16-2-2012 has no getDate() function. Am not able to find next date and the corresponding day. Is there any way to get it?
You have to convert the string d into a Date object:
function getTomorrow(d,offset){
if (!offset){
offset = 1;
}
if(typeof(d) === "string"){
var t = d.split("-"); /* splits dd-mm-year */
d = new Date(t[2],t[1] - 1, t[0]);
// d = new Date(t[2],t[1] - 1, t[0] + 2000); /* for dd-mm-yy */
}
return new Date(d.setDate(d.getDate() + offset));
}
document.write(getTomorrow('16-02-2012',20) + ' test');
var k = getTomorrow('16-02-2012',1);
var myTime = k.getDate()+'-'+(k.getMonth()+1)+'-'+k.getFullYear();
alert(myTime);
JSFiddle Demo. See also http://www.w3schools.com/jsref/jsref_obj_date.asp.
var d=new Date();
d.setTime((d.getTime() + 86400 * 1000*1));
document.write(d);
document.write(d.getDay()+"-"+parseInt(d.getMonth()+1)+"-"+d.getFullYear());
if you need to know the date of day after tommorow , just change 1000*1 to 1000*2.
i giving a example
var year = 2010, month = 9, day = 14;
// The value of `meses`
var offset = 1; // Tomorow
var future_date = new Date(year, month , day+offset);
console.log(future_date);