Moon phases and moon emojis in javascript

function moonphase()
{
  // Moon Phase Calculation
  var blueMoonDate = new Date(2016, 4, 22, 0, 14, 0); // in Helsinki
//  var show_date = new Date();
//  var currentDate = new Date(show_date.getFullYear(), show_date.getMonth(), show_date.getDate(), 0, 0, 0);
  var currentDate = new Date(); // 'cause its ad hoc
  var lunarPeriod  = 29*(24*3600*1000) + 12*(3600*1000) + 44.05*(60*1000);
  var moonPhaseTime = (currentDate.getTime() - blueMoonDate.getTime()) % lunarPeriod;
  var percentRaw = (moonPhaseTime / lunarPeriod);
  var lunarday = Math.round(29*percentRaw);
  if (lunarday<0) lunarday = Math.round(29+12/24+44.05/(24*60) + 29*percentRaw);
  return lunarday;
}

function moonemoji(phase)
{
  if(typeof(phase)==='undefined')
    phase = moonphase();
  if(phase < 1 || phase > 28) // full moon
    return "🌝";
  if(phase < 5)
    return "🌖";
  if(phase < 10)
    return "🌜";
  if(phase < 14)
    return "🌘";
  if(phase < 16)    // new moon = 14/15
    return "🌚";
  if(phase < 20)
    return "🌒";
  if(phase < 25)
    return "🌛";
  return "🌔";
}