JSFiddle - React, Tailwind, and code Playground

by baacke

HTML

<label>To:</label><input id="to" value="04/21/2014">
<br>
<label>From:</label><input id="from" value="">

CSS

label {display: inline-block;
    width: 45px}

JavaScript

$('#from').val( subtractDays($('#to').val(), 48) );

function subtractDays(startDate, daysToSubtract){
    startDate = startDate.split("/");
    var newDate = new Date(startDate[2], startDate[0], startDate[1])
    return newDate - daysToSubtract;
}