Try,

 alert((new Date()).getFullYear());

Create a new Date() object and call getFullYear():

new Date().getFullYear()  // returns the current year

Example usage: a page footer that always shows the current year:

document.getElementById("year").innerHTML = new Date().getFullYear();

footer {
  text-align: center;
  font-family: sans-serif;
}

<footer>
     <span id="year"></span> by Stack Overflow
</footer>

See also, the Date() constructor's full list of methods.

You can use Date():

this.curdate = (new Date().getMonth() + 1).toString() + '-' + new Date().getFullYear().toString();

Note that new Date().getMonth() start from 0 to 11 so you need to +1 to make it 1 to 12.

Update:

To add leading 0 based on related post you can do: '0' + (new Date().getMonth() + 1).toString().slice(-2)

Explanation:

Since '0' is not a number but a string when you add (+) with another string then it would be concatenated. Then .slice(-2) gives us the last two characters of the string. If it's single digit then it would be 0xmonth, if it's double digits then it would be 0 + xx month which are returned.

See snippet for example:

var d = '0' + (new Date().getMonth() + 1).toString().slice(-2) + '-' + new Date().getFullYear().toString();
document.getElementById("demo").innerHTML = d;

<p id="demo"></p>

Alternatively if you don't want a trailing 0 on double digit months (Oct, Nov, Dec) you could do a little checking based on month digit length: (new Date().getMonth() + 1).length > 1 ? new Date().getMonth() + 1 : '0' + (new Date().getMonth() + 1)

var month = (new Date().getMonth() + 1).length > 1 ? new Date().getMonth() + 1 : '0' + (new Date().getMonth() + 1);
var date = (month).toString().slice(-2) + '-' + new Date().getFullYear().toString();
document.getElementById("demo").innerHTML = date;

<p id="demo"></p>