Extjs2.2 开始时间,结束时间,工期 联动(选二补一),包含日期,天数的互转

var downtime_root_simple = {
            xtype : ‘numberfield‘,
            fieldLabel : ‘工期(天)‘,
            name : ‘plan_hours‘,
            id : ‘plan_hours‘,
            allowBlank : true,
            readOnly : flag == 4 ? true : false,
            maxLength : 11,
            anchor : ‘95%‘,
            listeners :  {
                 change : function(){
                     var plan_hours = Ext.getCmp("plan_hours");    
                    var plan_hours_value = Ext.getCmp("plan_hours").getValue();    
                    var plan_end_time = Ext.getCmp("plan_end_time");
                    var plan_end_time_value = Ext.getCmp("plan_end_time").getValue();
                    var plan_start_time = Ext.getCmp("plan_start_time");
                    var plan_start_time_value = Ext.getCmp("plan_start_time").getValue();
                    if (plan_start_time.isValid()) {
                         var date_S = new Date(plan_start_time_value);
                         plan_end_time.setValue(new Date(date_S.getTime() + (plan_hours_value-1)*24*60*60*1000));
                    } else if(plan_end_time.isValid()){
                        var date_E = new Date(plan_end_time_value);
                        plan_start_time.setValue(new Date(date_E.getTime() - (plan_hours_value-1)*24*60*60*1000));
                    }
                 }
            }
        };

var start_time_root = {
            xtype : ‘datefield‘,
            fieldLabel : ‘开始时间<font color="red">*</font>‘,
            name : ‘plan_start_time‘,
            id : ‘plan_start_time‘,
            format : "Y-m-d",
            allowBlank : false,
            editable : false,
            anchor : ‘95%‘,
            listeners : {
                "change" : function() {
                    var plan_hours = Ext.getCmp("plan_hours");    
                    var plan_hours_value = Ext.getCmp("plan_hours").getValue();    
                    var plan_end_time = Ext.getCmp("plan_end_time");
                    var plan_end_time_value = Ext.getCmp("plan_end_time").getValue();
                    var plan_start_time = Ext.getCmp("plan_start_time");
                    var plan_start_time_value = Ext.getCmp("plan_start_time").getValue();
                    if (plan_start_time.isValid()) {
                        var date_S = new Date(plan_start_time_value);
                        plan_end_time.setMinValue(plan_start_time_value);
                        if(plan_end_time_value){
                            var date_E = new Date(plan_end_time_value);
                            plan_hours.setValue((date_E.getTime() - date_S.getTime())/(24*60*60*1000)+1);
                        }else{
                            if(plan_hours_value){
                                plan_end_time.setValue(new Date(date_S.getTime() + plan_hours_value*24*60*60*1000));
                            }
                        }
                    } else {
                        plan_end_time.setMinValue(null);
                    }
                }
            }
        };

var end_time_root = {
            xtype : ‘datefield‘,
            fieldLabel : ‘结束时间<font color="red">*</font>‘,
            name : ‘plan_end_time‘,
            id : ‘plan_end_time‘,
            allowBlank : false,
            format : "Y-m-d",
            maxLength : 12,
            anchor : ‘95%‘,
            listeners : {
                "change" : function() {
                    var plan_hours = Ext.getCmp("plan_hours");    
                    var plan_hours_value = Ext.getCmp("plan_hours").getValue();    
                    var plan_end_time = Ext.getCmp("plan_end_time");
                    var plan_end_time_value = Ext.getCmp("plan_end_time").getValue();
                    var plan_start_time = Ext.getCmp("plan_start_time");
                    var plan_start_time_value = Ext.getCmp("plan_start_time").getValue();
                    if (plan_end_time.isValid()) {
                        var date_E = new Date(plan_end_time_value);
                        plan_start_time.setMaxValue(plan_end_time_value);
                        if(plan_start_time_value){
                            var date_S = new Date(plan_start_time_value);
                            plan_hours.setValue((date_E.getTime() - date_S.getTime())/(24*60*60*1000)+1);
                        }else{
                            if(plan_hours_value){
                                plan_start_time.setValue(new Date(date_E.getTime() - plan_hours_value*24*60*60*1000));
                            }
                        }
                    } else {
                        plan_start_time.setMaxValue(null);
                    }
                    show_change_reason();
                }
            }
        };