FLEX 时间计算

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
        layout="vertical" 
        verticalAlign="middle" 
        backgroundColor="white" 
        creationComplete="init()"> 
  
    <mx:Script> 
        <![CDATA[ 
            import mx.controls.dataGridClasses.DataGridColumn; 
            private function init():void { 
                var zeroDate:Date = new Date(0); 
  
                /* fullYear */ 
                arrColl.addItem({label:"+2 years", data:dateAdd("fullYear", 2, zeroDate)}); 
                arrColl.addItem({label:"-2 years", data:dateAdd("fullYear", -2, zeroDate)}); 
                /* month */ 
                arrColl.addItem({label:"+11 months", data:dateAdd("month", 11)}); 
                arrColl.addItem({label:"-11 months", data:dateAdd("month", -11)}); 
                /* date */ 
                arrColl.addItem({label:"+4 date", data:dateAdd("date", 4)}); 
                arrColl.addItem({label:"-4 date", data:dateAdd("date", -4)}); 
                /* hours */ 
                arrColl.addItem({label:"+6 hours", data:dateAdd("hours", 6)}); 
                arrColl.addItem({label:"-6 hours", data:dateAdd("hours", -6)}); 
                /* minutes */ 
                arrColl.addItem({label:"+45 minutes", data:dateAdd("minutes", 45)}); 
                arrColl.addItem({label:"-45 minutes", data:dateAdd("minutes", -45)}); 
                /* seconds */ 
                arrColl.addItem({label:"+900 seconds", data:dateAdd("seconds", 900)}); 
                arrColl.addItem({label:"-900 seconds", data:dateAdd("seconds", -900)}); 
                /* milliseconds */ 
                arrColl.addItem({label:"+720000 milliseconds", data:dateAdd("milliseconds", 720000)}); 
                arrColl.addItem({label:"-720000 milliseconds", data:dateAdd("milliseconds", -720000)}); 
            } 
  
            private function dateAdd(datepart:String = "", number:Number = 0, date:Date = null):Date { 
                if (date == null) { 
                    /* Default to current date. */ 
                    date = new Date(); 
                } 
  
                var returnDate:Date = new Date(date.time);; 
  
                switch (datepart.toLowerCase()) { 
                    case "fullyear": 
                    case "month": 
                    case "date": 
                    case "hours": 
                    case "minutes": 
                    case "seconds": 
                    case "milliseconds": 
                        returnDate[datepart] += number; 
                        break; 
                    default: 
                        /* Unknown date part, do nothing. */ 
                        break; 
                } 
                return returnDate; 
            } 
  
            private function data_labelFunc(item:Object, column:DataGridColumn):String { 
                return dateFormatter.format(item[column.dataField]); 
            } 
        ]]> 
    </mx:Script> 
  
    <mx:ArrayCollection id="arrColl" /> 
  
    <mx:DateFormatter id="dateFormatter" 
            formatString="YYYY/MM/DD HH:NN:SS" /> 
  
    <mx:Label text="Now: {dateAdd()}" /> 
    <mx:DataGrid id="dataGrid" 
            dataProvider="{arrColl}" 
            sortableColumns="false" 
            width="400"> 
        <mx:columns> 
            <mx:DataGridColumn dataField="label" 
                    headerText="Label" 
                    width="150" /> 
            <mx:DataGridColumn dataField="data" 
                    headerText="YYYY/MM/DD HH:NN:SS" 
                    labelFunction="data_labelFunc" /> 
        </mx:columns> 
    </mx:DataGrid> 
  
</mx:Application>

returnDate[datepart] += number;