Java解析日期字符串返回错误的月份

Question

我尝试解析日期字符串，但错误的月份，为什么？

new SimpleDateFormat("yyyy-MM-DD", Locale.US).parse("2018-03-08")

为什么这会将月份作为Jan返回？

请查看截图：

Answer 1

为什么不使用java.time API？

LocalDate localDate = LocalDate.parse("2018-03-08");

如果您想将LocalDate转换为java.util.Date，可以关注this answer。

Answer 2

This is due to the format you used as "yyyy-MM-DD". The parser will parse in the sequence way:

• Your input value is "2018-03-08"
• yyyy - will bring to the year 2018
• MM - will bring to the month MARCH

But what is DD? It's the number of the days from the beginning of the year. So here it moved back to 8^th day on this year (2018) which means January 8^th.

That's why you are seeing January instead of March.

Answer 3

您需要使用dd代替DD

试试这个： -

new SimpleDateFormat("yyyy-MM-dd", Locale.US).parse("2018-03-08");

Answer 4

如果您要显示月份名称，请查看此tutorial，您应使用3 M并且不是当天的标准D而不是yyyy-MMM-dd

我建议您尝试{{1}}

Answer 5

我在下面尝试过此操作，将DD更改为dd

工作正常

try {
            Date date=  new SimpleDateFormat("yyyy-MM-dd",Locale.US).parse("2018-03-08");

            Calendar calendar= Calendar.getInstance();
            calendar.setTime(date);
            Log.d("MONTH ","" + calendar.get(Calendar.MONTH));



        } catch (ParseException e) {
            e.printStackTrace();
        }