opacity.js

// This script progressively reduces the opacity of a site depending on a set number of days
// handly when you do a project and they refuse to pay you

(function () {
  const dueDate = new Date('2020-02-12'); // Put in date of submission to client
  const payDeadline = 30; // number of days as deadline for payment

  const currentDate = new Date();
  let utc1 = Date.UTC(dueDate.getFullYear(), dueDate.getMonth(), dueDate.getDate());
  let utc2 = Date.UTC(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate());
  const days = Math.floor((utc2 - utc1) / (1000 * 60 * 60 * 24));

  if (days > 0) {
    const daysLate = payDeadline - days;
    let opacity = (daysLate * 100 / payDeadline) / 100;
    opacity = (opacity < 0) ? 0 : opacity;
    opacity = (opacity > 1) ? 1 : opacity;
    if (opacity >= 0 && opacity <= 1) {
      document.getElementsByTagName('BODY')[0].style.opacity = opacity;
    }
  }
})();