Java.time.format.DateTimeParseException for dd-MMM-yyyy format

Question

I am trying to parse the dd-MMM-yyyy format date.

 package com.company; import javax.swing.text.DateFormatter; import java.time.format.DateTimeFormatter; import java.time.*; import java.util.Locale; public class Main { public static void main(String[] args) { // write your code here MonthDay m; Locale.setDefault(Locale.ENGLISH); DateTimeFormatter dTF = DateTimeFormatter.ofPattern("dd-MMM-yyyy"); String dateString = "12-jan-1900"; try { LocalDate ddd = LocalDate.parse(dateString,dTF); System.out.println(ddd.toString()); } catch (Exception e) { e.printStackTrace(); } //System.out.println(d.toString()); } } 

Throws the following exception

 java.time.format.DateTimeParseException: Text '12-jan-1900' could not be parsed at index 3 at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949) at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851) at java.time.LocalDate.parse(LocalDate.java:400) at com.company.Main.main(Main.java:20) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) 

It is well versed in the dd-MM-yyyy format, but does not match the dd-MMM-yyyy format. I was also tired of installing Locale.US , but in this case it also failed.

Answer 1

The reason is that the parsing is case sensitive by default, and the formatter does not recognize "jan" . He would only recognize "jan" .

You can build a dimensionless parser using DateTimeFormatterBuilder and call parseCaseInsensitive() :

Changes case-insensitive parsing style for the rest of the formatting.

The analysis may be case sensitive or case insensitive - by default, it is case sensitive. This method allows you to change the case sensitivity setting for parsing.

 DateTimeFormatter dTF = new DateTimeFormatterBuilder().parseCaseInsensitive() .appendPattern("dd-MMM-yyyy") .toFormatter();