java date parse missbehaviour

Question

SimpleDateFormat sdf = new SimpleDateFormat("MMM dd, YYYY, EEE", Locale.US);

System.out.println(sdf.format(new Date()));
System.out.println(sdf.format(sdf.parse("Apr 27, 2018, Fri")));

Java不会按预期解析日期并输出:

Apr 27, 2018, Fri
Jan 05, 2018, Fri // I can not understand why java parse the month of April as January

Answer 1

您的问题是您正在使用YYYY,代表Week year,而您想要yyyy代表哪个year,请在此处查看所有选项.

SimpleDateFormat sdf = new SimpleDateFormat("MMM dd, yyyy, EEE", Locale.US);