Untitled

dabblet.html

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Drag this link into your 
bookmark bar:
<a href='javascript: (function () {
  var field = document.querySelector("#promotion_days");

  function days(date) {
    var parts  = date.split("-");
    var year   = parseInt(parts[0]) + 2000;
    var month  = parseInt(parts[1]) - 1;
    var day    = parseInt(parts[2]);
    console.log(year, month, day);

    var now    = new Date();
    var then  = new Date(year, month, day, 0,0,0,0);

    var days = Math.ceil((then - now) / 1000 / 3600 / 24);

    return days;
  }

  var date = prompt("When should this gift expire? Tell me in YY-MM-DD format!");

  field.value = days(date);
}())'>Gift Expiry</a>

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Then while looking at a gift form, click the bookmarklet :)

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"html"}