I have created 3 select boxes containing days, months and year. What I really would like is to check after the user has selected a date, if the date is over a year from the current date a message is displayed or so.
Im a little stumped on what to do. Any gidance would be great.
Thanks
var ddlYear = document.getElementById('ddlYear');
var ddlMonth = document.getElementById('ddlMonth');
var ddlDay = document.getElementById('ddlDay');
var y = ddlYear[ddlYear.selectedIndex];
var m = ddlMonth[ddlMonth.selectedIndex];
var d = ddlDay[ddlDay.selectedIndex];
// past
var dt = new Date((y+1), (m-1), d);
var moreThanOnYearAgo = dt < new Date();
// future
var dt2 = new Date((y-1), (m-1), d);
var moreThanOnYearAhead = dt2 > new Date();
The y+1 is because if we're adding one year, and are still less than new Date() (today), then it's more than one year ago.
The m-1 is because months in the Date constructor are an enum, which means January is 0.
Don't reinvent the wheel one more time. Use a library that does validation.
There are 31556926000 milliseconds in a year. Just convert that date to a timestamp and subrtact the current date from it. If the result is greater than 31556926000 from it, is over a year away.
var userDate = new Date("11/29/2010");
var now = new Date();
var year_ms = 31556926000;
if ( userDate.getTime() - now.getTime() >= year_ms ) {
// A year away
} else {
// less than a year away
}
Related
I'm looking for the fastest method to build a timestamp which represents the current hour starting from the current instant (in general, starting from a timestamp)
Currently I'm doing the following:
var d = new Date();
var year = d.getUTCFullYear();
var month = d.getUTCMonth();
var day = d.getUTCDate();
var hour = d.getUTCHours();
d = new Date(year, month, day, hour);
console.log(d);
console.log(d.getTime());
Is it possible to avoid the second invocation of Date?
If I understand you correctly you want the timestamp of the beginning of the current hour. Then you could simply set the minutes and seconds to 0 in your first Date Object:
var d = new Date();
d.setMinutes(0,0);
console.log(d);
console.log(d.getTime());
You could make it a oneliner, since setMinutes() already returns a timestamp:
var timestamp = new Date().setMinutes(0,0);
Not sure why you're doing that twice, you really don't need to.
var d = new Date();
console.log(d.getHours());
// or
console.log(d.getTime() );
I have javascript array in which the date coming in is in this format
2015-11-25T17:54:19.033
However, I am not really concerned with the time
so I end up with
11/25/15
What I want to do in my loop is to LOOK at the date ( either 2015-11-25T17:54:19.033 or 11/25/15 , whatever is easier) and just set a variable to "NEW" if it is within the last 10 days
I was attempted to play around with this code and it does not give me what I want at all
var dt = "11/25/15";
var today = new Date()
var priorDate = new Date().setDate(today.getDate()-10)
console.log(dt);
console.log(today);
console.log(priorDate);
pseudo code of what i WANT
if ( dt <= today ) {
x = "NEW";
}
So my thoughts are that it need to be in Date objects in javascript but i'm not sure
Update
So say in a loop i have these variables that occur
for ....
dt = 9/13/15
Output = 9/13/15
next time in loop
dt = 11/24/15
Output = NEW - 11/24/15
Working jsfiddle
http://jsfiddle.net/bthorn/yr009hwd/
You are correct. You need to convert the string date to a date time object in javascript to do the comparison.In order to do the comparison, you need to get the millisec of the dates using getTime()
var dt = new Date("11/22/2015");
var today = new Date();
if ( dt.getTime() < today.getTime() ) {
alert('Past');
}
else
alert('future');
To check if the date difference is within 10 days:
var dt = new Date("11/12/2015");
var today = new Date();
var dateDiffDays = Math.ceil((Math.ceil(dt.getTime() - today.getTime()))/(1000 * 3600 * 24));
if( dateDiffDays >= -10 && dateDiffDays <= 10)
alert('date within 10 days');
Depending on the format of your date string, you can probably just do:
var dateToTest = new Date(dt);
//get 10 days earlier
dateToTest.setDate(dateToTest.getDate() - 10);
var today = new Date();
if ( dateToTest < today ) {
x = 'NEW';
}
//see if a date is within the last 10 days
var tenDaysAgo = new Date(); //current date
tenDaysAgo.setDate(tenDaysAgo.getDate() - 10); //ten days ago
//if you don't care about the time
tenDaysAgo.setHours(0);
tenDaysAgo.setMinutes(0);
tenDaysAgo.setSeconds(0);
tenDaysAgo.setMilliseconds(0);
var someDateToTest = new Date('11-1-2015');
if (tenDaysAgo > someDateToTest) {
//this is new
x = 'NEW';
}
I'm trying to build a javascript function that will auto-fill 14 days of a calendar with dates leading up to the last date, which is picked by a datepicker. So far my code is:
function filldates() {
datepicked = document.getElementById("period-ending").value;
s = datepicked.split('/');
enddate = new Date(s[2], s[0], s[1]);
date1 = enddate.setDate(enddate.getDate()-14);
day1 = date1.getMonth() + 1;
month1 = date1.getDate();
var firstday = day1 + '/' + month1;
document.getElementById("date-1").value = firstday;
}
However the developer's console keeps telling me that date1.getMonth is not a function. I'm confused because all of the tutorials and examples I've been looking at are based around something like: "var today = new Date(); var month = today.getMonth() + 1;"
Is this an implementation problem?
The setDate() function mutates its context date. It does not return a new Date instance.
If you want to create a new date instance that's some number of days ahead of another one:
function daysAfter(d, days) {
var nd = new Date(d.getTime());
nd.setDate(d.getDate() + days);
return nd;
}
Then if you've got a date, you can create a date 14 days after it like this:
var someDate = ... whatever ... ;
var fourteenDaysAfter = daysAfter(someDate, 14);
You can then use the .getMonth() and .getDate() accessors to do whatever formatting you want. Keep in mind that months are numbered from zero in JavaScript.
edit for dates before a date just pass a negative number.
I am trying to check if a date of format mm.dd.yyyy is greater than today and less than the date after 6 months from today.
Here is my code:
var isLinkExpiryDateWithinRange = function(value) {
var monthfield = value.split('.')[0];
var dayfield = value.split('.')[1];
var yearfield = value.split('.')[2];
var inputDate = new Date(yearfield, monthfield - 1, dayfield);
var today = new Date();
today = new Date(today.getFullYear(), today.getMonth(), today.getDate());
alert(inputDate > today);//alert-> true
var endDate = today;
endDate.setMonth(endDate.getMonth() + 6);
alert(inputDate > today);//alert-> false
if(inputDate > today && inputDate < endDate) {
alert('1');
} else {
alert('2');/always alert it
}
}
If I execute isLinkExpiryDateWithinRange('12.08.2012') I wish it will show 1 as this is within the range, but it is displaying 2. Moreover the first alert is showing true and the second one false.
Can anyone please explain what is happening?
Change:
var endDate = today;
to:
var endDate = new Date(today);
See the posts here for how objects are referenced and changed. There are some really good examples that help explain the issue, notably:
Instead, the situation is that the item passed in is passed by value.
But the item that is passed by value is itself a reference.
JSFiddle example
function isLinkExpiryDateWithinRange( value ) {
// format: mm.dd.yyyy;
value = value.split(".");
var todayDate = new Date(),
endDate = new Date( todayDate.getFullYear(), todayDate.getMonth() + 6, todayDate.getDate() +1 );
date = new Date(value[2], value[0]-1, value[1]);
return todayDate < date && date < endDate;
}
isLinkExpiryDateWithinRange("12.24.2012"); // true
isLinkExpiryDateWithinRange("12.24.2020"); // false
Below function checks if date selected is within 5 days from today. Date format used is "DD-MM-YYYY", you can use any format by changing value.split('-')[1] order and split character.
function showMessage() {
var value = document.getElementById("invoiceDueDate").value;
var inputDate = new Date(value.split('-')[2], value.split('-')[1] - 1, value.split('-')[0]);
var endDate = new Date();
endDate.setDate(endDate.getDate() + 5);// adding 5 days from today
if(inputDate < endDate) {
alert("If the due date selected for the invoice is within 5 days, and express settlement fee will apply to this transaction.");
}
}
I want to check two dates in java script. date format is YYYY-MM-dd.
var date1 = 2011-9-2;
var date1 = 2011-17-06;
Can anybody say how can I write condition?
If you mean that you want to compare them and your variables are strings, just use == for comparison.
var date1 = '1990-26-01';
var date2 = '2000-01-05';
if (date1 == date2) {
alert('date1 = date2')
}
else {
alert('something went wrong');
}
There are four ways of instantiating dates
var d = new Date();
var d = new Date(milliseconds);
var d = new Date(dateString);
var d = new Date(year, month, day, hours, minutes, seconds, milliseconds);
Here is the link to complete tutorial and function of creating, comparing dates http://www.w3schools.com/js/js_obj_date.asp
If you want to compare dates , have a look at the JS date object https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date , in particular the getTime() method .
Assuming the format is YYYY-MM-dd (your second date value breaks this rule) and that they are strings...
var date1 = '2011-9-2';
var date2 = '2011-06-17';
var fields = date1.split("-");
var d1 = new Date (fields[0], fields[1]-1, fields[2]);
var fields = date2.split("-");
var d2 = new Date (fields[0], fields[1]-1, fields[2]);