How to Parse an ISO 8601 String with a Missing Colon in the Offset to Java 8 Date?

Parsing an ISO 8601 String with a Missing Colon in Offset to Java 8 Date

Problem:

Java 8's ZonedDateTime.parse() method fails to parse a date string in ISO 8601 format that lacks a colon in the offset, such as "2018-02-13T10:20:12.120 0000."

Solution:

Until the bug is fixed (Java 8 through 121):

Use a DateTimeFormatter with a customized pattern to specify the missing colon in the offset:

<code class="java">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);</code>

When the bug is fixed:

Simply call OffsetDateTime.parse() with the ISO 8601 string without a pattern:

<code class="java">OffsetDateTime odt = OffsetDateTime.parse("2018-02-13T10:20:12.120+0000");</code>

Details:

• The OffsetDateTime class represents a date with an offset from UTC, which is appropriate for the input string.
• By default, java.time uses ISO 8601 formats for parsing, but it expects a colon in the offset.
• The DateTimeFormatter allows for customization, enabling you to specify the presence of the colon.
• To avoid ambiguity, it's recommended to use the colon in offsets, always provide both hours and minutes (even if zero), and pad zero to the left of a single-digit minute.

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