Difference analysis between getYear of and getFullYear of in JS

Var dayObj=new Date(); Dayobj. getYear() to get the year, which I wrote about earlier that would cause browser compatibility problems, which is that we get the results we want in IE but not in FF, 1900 years from what we want. And what I did was:

var dayObj=new Date();
var myYears = ( dayObj.getYear() < 1900 ) ? ( 1900 + dayObj.getYear() ) : dayObj.getYear();
document.write(myYears);

This will avoid compatibility problems with IE and FF.

Now I see a getFullYear() method in js. Let's test it out. It turns out that this method can avoid the problems above. Both IE and FF can be displayed as we want.

GetFullYear method
Returns the year value represented by the local time in the Date object.

DateObj. GetFullYear ()

The required dateObj parameter is a Date object.

instructions
To get a year value in global standard time (UTC), use the getUTCFullYear method.

The getFullYear method returns the year value as an absolute number. For example, the return value for 1976 is 1976. This avoids the y2k problem of confusing dates after 1 January 2000 with dates after 1 January 1900.

The following example illustrates the use of the GetFullYear method.

function DateDemo(){  
var d, s = " Today,  UTC  The date is : ";  
d = new Date();  
s += (d.getMonth() + 1) + "/";  
s += d.getDate() + "/";  
s += d.getFullYear();  
return(s);
}