How to determine one year from now in Javascript
JavascriptJavascript Problem Overview
I'm trying to get one year from now's date, and it's not working.
JS:
var now = new Date();
var oneYr = new Date();
oneYr.setYear(now.getYear() + 1);
$("#yearFromNow").append(oneYr.toString());
var oneMonth = new Date();
oneMonth.setMonth(now.getMonth() + 1);
$("#monthFromNow").append(oneMonth.toString());
Output:
one mo. = Thu Dec 22 112 15:16:01 GMT-0500 (Eastern Standard Time)
one yr. = Sun Jan 22 2012 15:16:01 GMT-0500 (Eastern Standard Time)
The year has Dec 22 112
- ?? The month is correctly displaying Jan 22 2012
.
If you want to tinker with it, http://jsbin.com/alezaj/edit#javascript,html,live. This is in Chrome and Firefox.
Thanks!
Javascript Solutions
Solution 1 - Javascript
This will create a Date
exactly one year in the future with just one line. First we get the fullYear
from a new Date
, increment it, set that as the year of a new Date
. You might think we'd be done there, but if we stopped it would return a timestamp, not a Date
object so we wrap the whole thing in a Date
constructor.
new Date(new Date().setFullYear(new Date().getFullYear() + 1))
Solution 2 - Javascript
You should use getFullYear()
instead of getYear()
. getYear()
returns the actual year minus 1900 (and so is fairly useless).
Thus a date marking exactly one year from the present moment would be:
var oneYearFromNow = new Date();
oneYearFromNow.setFullYear(oneYearFromNow.getFullYear() + 1);
Note that the date will be adjusted if you do that on February 29.
Similarly, you can get a date that's a month from now via getMonth()
and setMonth()
. You don't have to worry about "rolling over" from the current year into the next year if you do it in December; the date will be adjusted automatically. Same goes for day-of-month via getDate()
and setDate()
.
Solution 3 - Javascript
As setYear()
is deprecated, correct variant is:
// plus 1 year
new Date().setFullYear(new Date().getFullYear() + 1)
// plus 1 month
new Date().setMonth(new Date().getMonth() + 1)
// plus 1 day
new Date().setDate(new Date().getDate() + 1)
All examples return Unix timestamp, if you want to get Date
object - just wrap it with another new Date(...)
Solution 4 - Javascript
Use this:
var startDate = new Date();
startDate.setFullYear(startDate.getFullYear() - 1);
Solution 5 - Javascript
Using some of the answers on this page and here, I came up with my own answer as none of these answers fully solved it for me.
Here is crux of it
var startDate = "27 Apr 2017";
var numOfYears = 1;
var expireDate = new Date(startDate);
expireDate.setFullYear(expireDate.getFullYear() + numOfYears);
expireDate.setDate(expireDate.getDate() -1);
And here a a JSFiddle that has a working example: https://jsfiddle.net/wavesailor/g9a6qqq5/
Solution 6 - Javascript
Use setFullyear as others have posted but be aware this returns a timestamp value not a date object. It is also a good candidate imho to add functionality via the prototype. This leads us to the following pattern:
Date.prototype.addYears = function(n) {
var now = new Date();
return new Date(now.setFullYear(now.getFullYear() + n));
};
console.log('Year from now is', new Date().addYears(1));
Solution 7 - Javascript
In very simple way. use this code.
// define function
function nextYearDate(date1) {
var date2 = new Date(date1);
var date3 = date2.setDate(date2.getDate() - 1);
var date = new Date(date3);
var day = date.getDate();
var month = date.getMonth()+1;
var year = date.getFullYear()+1;
var newdate = year + '-' + (month < 10 ? '0' : '') + month + '-' + (day < 10 ? '0' : '') + day;
$("#next_date").val(newdate);
}
// call function.
<input type="date" name="current_date" id="current_date" value="" onblur="nextYearDate(this.value);" />
<input type="date" name="next_date" id="next_date" value="" onblur="nextYearDate(this.value);" />