how can you add one month to a date in javascript / jquery

Question

if i have a textbox with a date in it, i want to change the textbox to show one month later

Answer 1

You'll have to get the text out of the text box, which you can then pass to the Date() constructor:

var d = new Date(text);

Then format the date string:

var str = d.getDate(), d.getMonth() + 1, d.getFullYear()

And set the test box to that value

Answer 2

// assumes document.form1.textbox1.value is a parseable date
var d = new Date( document.form1.textbox1.value );
d.setMonth( d.getMonth( ) + 1 );
document.form1.textbox1.value = ( d.getMonth( ) + 1 ) + '/' + d.getDate( ) + '/' + d.getFullYear( );

Set month supposed to be range proof, as described here.