How to Parse ISO 8601 Dates with Missing Colon in Offset in Java 8?

Parsing Data in ISO 8601 Format Without Colon in Offset

Problem

Java 8's DateTimeFormatter struggles to parse ISO 8601 strings lacking a colon between hours and minutes in the offset, causing difficulties for users attempting to convert strings like "2018-02-13T10:20:12.120 0000" into Java 8 dates.

Solution

Until Java 8 Bug Fix:

Until the bug in Java 8 is resolved, use the following workaround:

OffsetDateTime.parse( 
    "2018-02-13T10:20:12.120+0000" , 
    DateTimeFormatter.ofPattern( "uuuu-MM-dd'T'HH:mm:ss.SSSX" )
)

After Java 8 Bug Fix:

OffsetDateTime.parse( "2018-02-13T10:20:12.120+0000" )

Detailed Explanation

Wrong Class Usage

Avoid using legacy classes like Date, Calendar, and SimpleDateFormat in favor of modern java.time classes.

Use OffsetDateTime for Offset-Only Values

For values with offsets but no time zone, use OffsetDateTime. ISO 8601 strings typically comply with the standard formats used by java.time classes. However, a bug in Java 8 requires a workaround:

Hacky Workaround

Manipulate the input string to include the missing colon:

String input = "2018-02-13T10:20:12.120+0000".replace( "+0000" , "+00:00" );
OffsetDateTime odt = OffsetDateTime.parse( input );

More Robust Workaround

Define a DateTimeFormatter with an explicit pattern:

String input = "2018-02-13T10:20:12.120+0000" ;
DateTimeFormatter f = DateTimeFormatter.ofPattern( "uuuu-MM-dd'T'HH:mm:ss.SSSX" );
OffsetDateTime odt = OffsetDateTime.parse( input , f );

Additional Considerations

• Always use offsets with a colon and both hours and minutes.
• Extract Instant objects to represent values in UTC.
• Apply time zones to view moments through the lens of specific regions' wall-clock time.

About the Java 8 Bug

The Java 8 bug affects the parsing of offsets missing the colon between hours and minutes. This issue affects offsets like 0000 but not 00:00.

Java.time

java.time classes supplant legacy date classes and are built into Java 8 and later. They provide more modern and efficient date-time handling capabilities.

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