DateInput=(function(A){function B(C,D){if(typeof (D)!="object"){D={}}A.extend(this,B.DEFAULT_OPTS,D);this.input=A(C);this.bindMethodsToObj("show","hide","hideIfClickOutside","keydownHandler","selectDate");this.build();this.selectDate();this.hide()}B.DEFAULT_OPTS={month_names:["January","February","March","April","May","June","July","August","September","October","November","December"],short_month_names:["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],short_day_names:["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],start_of_week:1};B.prototype={build:function(){var C=A('<p class="month_nav"><span class="button prev" title="[Page-Up]">&#171;</span> <span class="month_name"></span> <span class="button next" title="[Page-Down]">&#187;</span></p>');this.monthNameSpan=A(".month_name",C);A(".prev",C).click(this.bindToObj(function(){this.moveMonthBy(-1)}));A(".next",C).click(this.bindToObj(function(){this.moveMonthBy(1)}));var D=A('<p class="year_nav"><span class="button prev" title="[Ctrl+Page-Up]">&#171;</span> <span class="year_name"></span> <span class="button next" title="[Ctrl+Page-Down]">&#187;</span></p>');this.yearNameSpan=A(".year_name",D);A(".prev",D).click(this.bindToObj(function(){this.moveMonthBy(-12)}));A(".next",D).click(this.bindToObj(function(){this.moveMonthBy(12)}));var E=A('<div class="nav"></div>').append(C,D);var F="<table><thead><tr>";A(this.adjustDays(this.short_day_names)).each(function(){F+="<th>"+this+"</th>"});F+="</tr></thead><tbody></tbody></table>";this.dateSelector=this.rootLayers=A('<div class="date_selector"></div>').append(E,F).insertAfter(this.input);if(A.browser.msie&&A.browser.version<7){this.ieframe=A('<iframe class="date_selector_ieframe" frameborder="0" src="#"></iframe>').insertBefore(this.dateSelector);this.rootLayers=this.rootLayers.add(this.ieframe);A(".button",E).mouseover(function(){A(this).addClass("hover")});A(".button",E).mouseout(function(){A(this).removeClass("hover")})}this.tbody=A("tbody",this.dateSelector);this.input.change(this.bindToObj(function(){this.selectDate()}));this.selectDate()},selectMonth:function(D){var J=new Date(D.getFullYear(),D.getMonth(),1);if(!this.currentMonth||!(this.currentMonth.getFullYear()==J.getFullYear()&&this.currentMonth.getMonth()==J.getMonth())){this.currentMonth=J;var I=this.rangeStart(D),H=this.rangeEnd(D);var C=this.daysBetween(I,H);var F="";for(var E=0;E<=C;E++){var G=new Date(I.getFullYear(),I.getMonth(),I.getDate()+E,12,0);if(this.isFirstDayOfWeek(G)){F+="<tr>"}if(G.getMonth()==D.getMonth()){F+='<td class="selectable_day" date="'+this.dateToString(G)+'">'+G.getDate()+"</td>"}else{F+='<td class="unselected_month" date="'+this.dateToString(G)+'">'+G.getDate()+"</td>"}if(this.isLastDayOfWeek(G)){F+="</tr>"}}this.tbody.empty().append(F);this.monthNameSpan.empty().append(this.monthName(D));this.yearNameSpan.empty().append(this.currentMonth.getFullYear());A(".selectable_day",this.tbody).click(this.bindToObj(function(K){this.changeInput(A(K.target).attr("date"))}));A("td[date="+this.dateToString(new Date())+"]",this.tbody).addClass("today");A("td.selectable_day",this.tbody).mouseover(function(){A(this).addClass("hover")});A("td.selectable_day",this.tbody).mouseout(function(){A(this).removeClass("hover")})}A(".selected",this.tbody).removeClass("selected");A("td[date="+this.selectedDateString+"]",this.tbody).addClass("selected")},selectDate:function(C){if(typeof (C)=="undefined"){C=this.stringToDate(this.input.val())}if(!C){C=new Date()}this.selectedDate=C;this.selectedDateString=this.dateToString(this.selectedDate);this.selectMonth(this.selectedDate)},changeInput:function(C){this.input.val(C).change();this.hide()},show:function(){this.rootLayers.css("display","block");A([window,document.body]).click(this.hideIfClickOutside);this.input.unbind("focus",this.show);A(document.body).keydown(this.keydownHandler);this.setPosition()},hide:function(){this.rootLayers.css("display","none");A([window,document.body]).unbind("click",this.hideIfClickOutside);this.input.focus(this.show);A(document.body).unbind("keydown",this.keydownHandler)},hideIfClickOutside:function(C){if(C.target!=this.input[0]&&!this.insideSelector(C)){this.hide()}},insideSelector:function(C){var D=this.dateSelector.position();D.right=D.left+this.dateSelector.outerWidth();D.bottom=D.top+this.dateSelector.outerHeight();return C.pageY<D.bottom&&C.pageY>D.top&&C.pageX<D.right&&C.pageX>D.left},keydownHandler:function(C){switch(C.keyCode){case 9:case 27:this.hide();return ;break;case 13:this.changeInput(this.selectedDateString);break;case 33:this.moveDateMonthBy(C.ctrlKey?-12:-1);break;case 34:this.moveDateMonthBy(C.ctrlKey?12:1);break;case 38:this.moveDateBy(-7);break;case 40:this.moveDateBy(7);break;case 37:this.moveDateBy(-1);break;case 39:this.moveDateBy(1);break;default:return }C.preventDefault()},stringToDate:function(C){var D;if(D=C.match(/^(\d{1,2}) ([^\s]+) (\d{4,4})$/)){return new Date(D[3],this.shortMonthNum(D[2]),D[1],12,0)}else{return null}},dateToString:function(C){return C.getDate()+" "+this.short_month_names[C.getMonth()]+" "+C.getFullYear()},setPosition:function(){var C=this.input.offset();this.rootLayers.css({top:C.top+this.input.outerHeight(),left:C.left});if(this.ieframe){this.ieframe.css({width:this.dateSelector.outerWidth(),height:this.dateSelector.outerHeight()})}},moveDateBy:function(D){var C=new Date(this.selectedDate.getFullYear(),this.selectedDate.getMonth(),this.selectedDate.getDate()+D);this.selectDate(C)},moveDateMonthBy:function(D){var C=new Date(this.selectedDate.getFullYear(),this.selectedDate.getMonth()+D,this.selectedDate.getDate());if(C.getMonth()==this.selectedDate.getMonth()+D+1){C.setDate(0)}this.selectDate(C)},moveMonthBy:function(C){var D=new Date(this.currentMonth.getFullYear(),this.currentMonth.getMonth()+C,this.currentMonth.getDate());this.selectMonth(D)},monthName:function(C){return this.month_names[C.getMonth()]},bindToObj:function(D){var C=this;return function(){return D.apply(C,arguments)}},bindMethodsToObj:function(){for(var C=0;C<arguments.length;C++){this[arguments[C]]=this.bindToObj(this[arguments[C]])}},indexFor:function(E,D){for(var C=0;C<E.length;C++){if(D==E[C]){return C}}},monthNum:function(C){return this.indexFor(this.month_names,C)},shortMonthNum:function(C){return this.indexFor(this.short_month_names,C)},shortDayNum:function(C){return this.indexFor(this.short_day_names,C)},daysBetween:function(D,C){D=Date.UTC(D.getFullYear(),D.getMonth(),D.getDate());C=Date.UTC(C.getFullYear(),C.getMonth(),C.getDate());return(C-D)/86400000},changeDayTo:function(C,D,E){var F=E*(Math.abs(D.getDay()-C-(E*7))%7);return new Date(D.getFullYear(),D.getMonth(),D.getDate()+F)},rangeStart:function(C){return this.changeDayTo(this.start_of_week,new Date(C.getFullYear(),C.getMonth()),-1)},rangeEnd:function(C){return this.changeDayTo((this.start_of_week-1)%7,new Date(C.getFullYear(),C.getMonth()+1,0),1)},isFirstDayOfWeek:function(C){return C.getDay()==this.start_of_week},isLastDayOfWeek:function(C){return C.getDay()==(this.start_of_week-1)%7},adjustDays:function(E){var D=[];for(var C=0;C<E.length;C++){D[C]=E[(C+this.start_of_week)%7]}return D}};A.fn.date_input=function(C){return this.each(function(){new B(this,C)})};A.date_input={initialize:function(C){A("input.date_input").date_input(C)}};return B})(jQuery)

$.extend(DateInput.DEFAULT_OPTS, {
  stringToDate: function(string) {
    var matches;
    if (matches = string.match(/^(\d{4,4})-(\d{2,2})-(\d{2,2})$/)) {
      return new Date(matches[1], matches[2] - 1, matches[3]);
    } else {
      return null;
    };
  },

  dateToString: function(date) {
    var month = (date.getMonth() + 1).toString();
    var dom = date.getDate().toString();
    if (month.length == 1) month = "0" + month;
    if (dom.length == 1) dom = "0" + dom;
    return date.getFullYear() + "-" + month + "-" + dom;
  }
});