akka/akka-core

Slf4jLogger formatTimestamp return date/time in ISO 8601 (akkaTimestamp)

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#18,079 opened on Jul 26, 2015

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 (4 comments) (2 reactions) (0 assignees)Scala (13,277 stars) (3,547 forks)batch import
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Description

Currently %X{akkaTimestamp} returns only a time portion of the timestamp, e.g.:

00:13:35.140UTC

Absence of the date part is very inconvenient for logging, would be great to have it contain the date, especially return it in the ISO 8601 format, like:

2015-07-26T17:40:08.484Z

This is a very common format these days, especially when readability is essential (as opposite to numeric timestamps), heavily used in JSON, very easy for parsing, also this is a default output format for the java.time.OffsetDateTime toString method.

protected def formatTimestamp(timestamp: Long): String =
  OffsetDateTime.ofInstant(Instant.ofEpochMilli(timestamp), ZoneOffset.UTC).toString

Contributor guide

Tech stack
None
Domain
backendobservability
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic Scala syntaxAkka logging concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75
Research direction
Locate the Slf4jLogger class, likely in the akka slf4j module. Find the formatTimestamp method and change its implementation to return an ISO 8601 formatted string using OffsetDateTime.ofInstant. Ensure the necessary import for java.time.OffsetDateTime is added. Review existing unit tests for timestamp formatting and update them accordingly. Check if there are any configuration options that might affect the format.