Cannot parse E MMM dd yyyy date

Question

I have the following code:

public static String convert( final String date )
{
    final DateTimeFormatterBuilder dateTimeFormatterBuilder = new DateTimeFormatterBuilder()
        .appendOptional( DateTimeFormatter.ofPattern( "dd-MM-yyyy" ) )
        .appendOptional( DateTimeFormatter.ofPattern( "dd/MM/yyyy" ) )
        .appendOptional( DateTimeFormatter.ofPattern( "E MMM dd yyyy" ) )
        .parseDefaulting( ChronoField.HOUR_OF_DAY, 0 )
        .parseDefaulting( ChronoField.MINUTE_OF_HOUR, 0 )
        .parseDefaulting( ChronoField.SECOND_OF_MINUTE, 0 );

    final LocalDateTime dateTime = LocalDateTime.parse( date, dateTimeFormatterBuilder.toFormatter() );

    return dateTime.format( DateTimeFormatter.ofPattern( "dd-MM-yyyy" ) );
}

But when the date is the following: Tue Apr 19 2022

It fails to convert but it shouldn't since the "E MMM dd yyyy" is there.

java.time.format.DateTimeParseException: Text 'Tue Apr 19 2022' could not be parsed, unparsed text found at index 0

Thanks

Have you tried putting `EEE` instead of `E` in the format string? — juzraai, Apr 19 '22 at 12:07
@kylie.zoltan I doubt that. It fails for me as well, but if I call `toFormatter(Locale.ROOT)` instead of `toFormatter()`, then it works for me. — MC Emperor, Apr 19 '22 at 12:21

score 1 · Accepted Answer · answered Apr 19 '22 at 16:13

Specify `Locale`

Specify a locale, to determine a human language and culture to use in translation.

final DateTimeFormatterBuilder dateTimeFormatterBuilder = new DateTimeFormatterBuilder()
    .appendOptional( DateTimeFormatter.ofPattern( "dd-MM-yyyy" ) )
    .appendOptional( DateTimeFormatter.ofPattern( "dd/MM/yyyy" ) )
    .appendOptional( DateTimeFormatter.ofPattern( "E MMM dd yyyy" ) )
    .parseDefaulting( ChronoField.HOUR_OF_DAY, 0 )
    .parseDefaulting( ChronoField.MINUTE_OF_HOUR, 0 )
    .parseDefaulting( ChronoField.SECOND_OF_MINUTE, 0 );

String input = "Tue Apr 19 2022" ;
Locale locale = Locale.US ;
final LocalDateTime ldt = LocalDateTime.parse( input , dateTimeFormatterBuilder.toFormatter().withLocale( locale ) );
System.out.println ( ldt ) ;

See this code run live at IdeOne.com.

2022-04-19T00:00

Cannot parse E MMM dd yyyy date

1 Answers1

Specify Locale

Specify `Locale`