Ext的DateField获取当前日期的前一天、当前日期、本月的第一天

日期控件：

new Ext.form.DateField( {
?????????fieldLabel : '开始日期',
?????????id : 'beginDate',
?????????width : 90,
?????????//value:sys.sysDate.substring(0,7)+'-01',
?????????value: timeYesterday,
?????????format:'Y-m-d',
?????????allowBlank : true,
?????????listeners : {
??????????specialkey : function(field, e){
???????????if(e.getKey() == Ext.EventObject.ENTER){
????????????loadGrid(settlementRrunStatusQueryDetailDatastore);
???????????}
??????????}
?????????}
????????})

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timeYesterday：

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var curDate = new Date();
var preDate = new Date(curDate.getTime() - 24*60*60*1000);??

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//获取当前日期的前一天
var timeYesterday = preDate.format("Y") +"-" +preDate.format("m") + "-"+(preDate.format("d"));//昨天

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//获取当前日期

var timeToday = curDate.format("Y") +"-" +curDate.format("m") + "-"+(curDate.format("d"));//今天

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//获取本月的第一天

var timeFirstDay = preDate.format("Y") +"-" +preDate.format("m") + "-01";//本月第一天