"use strict";
const addMonths = require("./addMonths.js");
function monthDiff(a, b) {
  const aTime = +a;
  const bTime = +b;
  if (aTime < bTime) {
    return -monthDiff(b, a);
  }
  const wholeMonthDiff = (b.getFullYear() - a.getFullYear()) * 12 + (b.getMonth() - a.getMonth());
  const anchor = +addMonths(new Date(aTime), wholeMonthDiff);
  let anchor2;
  let adjust;
  if (bTime < anchor) {
    anchor2 = +addMonths(new Date(aTime), wholeMonthDiff - 1);
    adjust = (bTime - anchor) / (anchor - anchor2);
  } else {
    anchor2 = +addMonths(new Date(aTime), wholeMonthDiff + 1);
    adjust = (bTime - anchor) / (anchor2 - anchor);
  }
  return -(wholeMonthDiff + adjust) || 0;
}
exports.monthDiff = monthDiff;