a calendar datepicker, for photoshop scripts

calendar.jsx

var calendarData = {};
var calendar = new Window( 'dialog', 'calendar' );

calendar.MonthAndYear = calendar.add('group');

var MonthAndYear = calendar.MonthAndYear;
var months = ["January", "Feburary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
var month = MonthAndYear.add('dropdownlist', undefined, months);
var thisMonth = new Date().getMonth();
month.selection = month.items[thisMonth];

var years = (function(){
  var yearArray = [];
  var startYear = new Date().getFullYear() - 2;
  for (var i = 0; i < 5; i++) {
    yearArray.push(startYear + i);
  }

  return yearArray;
})();
var year = MonthAndYear.add('dropdownlist', undefined, years);
year.selection = year.items[2];

function daysInMonth(month,year) {
  return new Date(year, month + 1, 0).getDate();
}

function firstDayOfMonth(month, year) {
  var requestedMonth = new Date(year, month, 1);
  requestedMonth.setDate(1);
  return requestedMonth.getDay();
}

calendar.dayLabels = calendar.add('group', [0, 25, 300, 40]);
  var days = calendar.dayLabels;
  days.day1 = days.add('statictext', [0,0,8,0], 'S')
  days.day2 = days.add('statictext', [45, 0, 60, 0], 'M')
  days.day3 = days.add('statictext', [90, 0, 98, 0], 'T')
  days.day4 = days.add('statictext', [135, 0, 148, 0],  'W')
  days.day5 = days.add('statictext', [185, 0, 193, 0],  'T')
  days.day6 = days.add('statictext', [230, 0, 238, 0],  'F')
  days.day7 = days.add('statictext', [275, 0, 283, 0],  'S')

function cleanUpMonth() {
  var thisWeek = 1;
  while (typeof calendar['week' + thisWeek] === "object") {
    delete calendar['week' + thisWeek];
    thisWeek = thisWeek + 1;
  }
}

function disableOthers(checked) {
  calendarData.selectedDay = checked;
  for (var i = 0; i <= calendarData.days.length; i++) {
    if (calendarData.days[i].text !== checked) {
      calendarData.days[i].value = false;
    }
  }
}

function updateDays() {
  var thisMonth = month.selection;
  var thisYear = parseInt(year.selection.toString(), 10);
  var startPadding = originalPadding = firstDayOfMonth(thisMonth, thisYear);
  var totalDays = daysInMonth(thisMonth, thisYear) + startPadding;
  var endPadding = ((Math.ceil(totalDays/7) * 7) - totalDays);
  var extraDays = (calendarData.days.length - totalDays - endPadding > 0 ? calendarData.days.length - totalDays - endPadding : 0);

  if ((totalDays + endPadding) < calendarData.days.length) {
    calendarData.days = calendarData.days.slice(0, (totalDays + endPadding));
  }

  for (var i = 1; i <= (totalDays + endPadding + extraDays); i++) {
    var thisDay = calendarData.days[i - 1];

    if (!thisDay) {
      var thisWeek = calendar['week' + Math.floor(i/7)];
      if (typeof thisWeek !== 'object') {
        thisWeek = calendar.add('group');
      }
      thisDay = calendarData.days[i] = thisWeek.add('radiobutton', undefined, i);
    }

    if (startPadding > 0) {
      thisDay.enabled = false;
      thisDat.text = '00';
      startPadding = startPadding - 1;
    }
    else if (i <= totalDays) {
      thisDay.enabled = true;
      thisDay.text = (i.toString().length === 2 ? i : '0' + (i - originalPadding).toString());
    }
    else {
      thisDay.enabled = false;
      thisDat.text = 00;
    }
  }
}

function setUpMonth() {
  var thisMonth = month.selection;
  var thisYear = parseInt(year.selection.toString(), 10);

  var startPadding = originalPadding = firstDayOfMonth(thisMonth, thisYear);
  var totalDays = daysInMonth(thisMonth, thisYear) + startPadding;
  var endPadding = ((Math.ceil(totalDays/7) * 7) - totalDays);
  var today = new Date().getDate() + startPadding;

  calendarData.days = [];

  for (var i = 1; i <= (totalDays + endPadding); i++) {
   var thisLine = (Math.floor((i - 1)/7));
   var shouldDisable = false;

   if (typeof calendar['week' + thisLine] !== 'object') {
     calendar['week' + thisLine] = calendar.add('group');
   }

   var thisWeek = calendar['week' + thisLine];
   var dayLabel;

   if (startPadding > 0) {
    dayLabel = '00'
    startPadding = startPadding - 1
    shouldDisable = true;
   }
   else if (i <= totalDays) {
     var day = (i - originalPadding);
     dayLabel = (day.toString().length === 2 ? day : '0' + day);
   }
   else {
    dayLabel = '00'
    shouldDisable = true;
   }

   thisWeek[dayLabel] = thisWeek.add('radiobutton', undefined, dayLabel);
   if (shouldDisable) {
     thisWeek[dayLabel].enabled = false;
   }
   else if (i === today) {
     calendarData.selectedDay = thisWeek[dayLabel].text;
     thisWeek[dayLabel].value = true;
   }

   thisWeek[dayLabel].onClick = function() {
    if (this.enabled) {
      disableOthers(this.text);
    }
   }

   calendarData.days.push(thisWeek[dayLabel]);
  }
}

setUpMonth();


calendar.buttons = calendar.add('group');
var button = calendar.buttons.add('button', undefined, 'select');

month.onChange = function() {
  updateDays()
};

year.onChange = function() {
  updateDays();
};

button.onClick = function() {
  var selectedYear = year.selection;
  var selectedMonth = months.indexOf(month.selection.toString());
  var selectedDay = parseInt(calendarData.selectedDay, 10);

  calendarData.finalDate = new Date(selectedYear, selectedMonth, selectedDay);

  alert(calendarData.finalDate.getFullYear() + 110);
  alert(calendarData.finalDate.getDate());
  alert(calendarData.finalDate.getMonth());
}

calendar.show();