java : How can I cast Date from "Thu May 01 00:00:00 WEST 2014 " to "2014-01-05 00:00:00.0"

Question

我如何才能将日期从“Thu May 01 00:00:00 WEST 2014”转换到“2014-01-05 00:00:00.0”

我尝试使用这段代码:

SimpleDateFormat toFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
        String dateStr = getDtdebut().toString();
        Date date = new Date();
        try {
            date = toFormat.parse(dateStr);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

但我有这个错误:

java.text.ParseException: Unparseable date: "Thu May 01 00:00:00 WEST 2014"
at java.text.DateFormat.parse(Unknown Source)
at ensa.pfe.action.GestionOperations.filtre(GestionOperations.java:386)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
..........

Answer 1

java.util.Date 只是时间戳值(即自 UNIX 纪元以来的毫秒数)的包装类。该对象与任何特定的日期格式甚至日历系统都没有任何联系。

您需要的只是格式化日期，而不是使用某些默认格式化程序将其转换为字符串，然后再次将其解析回格式独立对象。使用DateFormat#format .

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
System.out.println(format.format(getDtdebut()));