To fully align with ISO-8601, use yyyy-MM-dd'T'HH:mm:ss.SSSXXX as the default logging date format

See original GitHub issue

At present the default logging pattern does not append any timezone / offset information to the time of the event. This makes it impossible to parse back into an instant reliably (e.g. when using a log exporter to push a docker container’s stdout to elasticsearch or similar), because the timezone will be system / system property dependent.

Should just be a matter of adding XXX to the end of the default for LOG_DATEFORMAT_PATTERN in org/springframework/boot/logging/logback/defaults.xml & org.springframework.boot.logging.logback.DefaultLogbackConfiguration.

A good test is that the result is parseable by ZonedDateTime.parse. See DateConverterSpec which shows only XXX reliably produces a parseable ISO 8601 string.

Issue Analytics

State:
Created 2 years ago
Comments:9 (3 by maintainers)

Top GitHub Comments

2reactions

wilkinsonacommented, Apr 27, 2022

We’ve discussed this today and we’re going to add the T. We’ll make the changes for both Logback and Log4j2.

0reactions

michael-ocommented, Apr 26, 2022

@wilkinsona Yes, please do so. ISO 8601 clearly says (if you have access to the document): the ‘T’ can be replaced with a space only if a mutual agreement has been done between parties.

Same mistake was done in Git and they have ‘corrected’ with iso-strict.

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