Why does Java have support for time zone offsets with seconds precision?

Why does Java have support for time zone offsets with seconds precision?

<a href="https://en.wikipedia.org/wiki/ISO_8601#Time_offsets_from_UTC" target="_blank">On Wikipedia</a>&nbsp;time zone offsets are explained as the difference in hours and minutes from standard UTC time. However,&nbsp;<a href="https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/time/format/DateTimeFormatter.html#patterns" target="_blank">DateTimeFormatter</a>&nbsp;supports zone-offset pattern&nbsp;<code>XXXXX</code>, which "outputs the hour and minute and optional second, with a colon, such as '+01:30:15'."

On Wikipedia time zone offsets are explained as the difference in hours and minutes from standard UTC time. However, DateTimeFormatter supports zone-offset pattern XXXXX, which "outputs the hour and minute and optional second, with a colon, such as '+01:30:15'."

Are offsets like +01:30:15 ISO valid? If not, based on which standard does Java define such offsets?

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