Java 使用grails2.3.7写入excel工作表时如何获取日期格式

数据表中有一个值。 列是订单日期，格式类似于2014-11-06 20:27:40。 当我们使用下面的代码导出时

response.contentType = grailsApplication.config.grails.mime.types[params.formattext]
response.setHeader("Content-disposition", "attachment; filename=Manual Order list.${params.formattext}")

List fields = ["orderDate","id","firstName","account","paymentMode","transactionId"]
Map labels = ["orderDate":"OrderDate","id":"Order No","firstName":"Customer Name",
             "account":"Account", "paymentMode":"Payment Method",
             "transactionId":"Transaction Id"]
//Map parameters = [OrderType: "User Order", "column.widths": [0.2, 0.3, 0.5]]
exportService.export(params.formattext, response.outputStream,userOrderCriteria?.list{between("orderDate",d1,d2)}, 
                     fields, labels, [:], [:]) 

然后在excel表格中，订单日期值为27:40，表示仅为分钟和秒。 请帮帮我。如何获得保存在数据表中的完整格式