[LOG4J2-1246] PatternLayout %date conversion pattern should render time zone designator for ISO-ISO8601

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.1, 2.5
• Fix Version/s: 2.11.2
• Component/s: Pattern Converters
• Assignee: Unassigned
• Reporter: Daniel Marcotte
• Created: 06/Jan/16 15:26
• Updated: 07/Dec/18 21:27
• Resolved: 05/Dec/18 00:23

Description

Hi there!

There might be a small issue with the Pattern Converters regarding Timezone management: http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout

Right now, these patterns:

• "%d{ISO8601_BASIC}
• %d{ISO8601_BASIC}{UTC}

Give the same results:

• 20160104T204256,048
• 20160104T204256,048

However, with a deeper look at the ISO-8601 standards, the second one with "{UTC}" should properly add the Timezone at the end of the timestamp.

Reference: https://en.wikipedia.org/wiki/ISO_8601#Times

UTC
If the time is in UTC, add a Z directly after the time without a space. Z is the zone designator for the zero UTC offset. "09:30 UTC" is therefore represented as "09:30Z" or "0930Z". "14:45:15 UTC" would be "14:45:15Z" or "144515Z".
UTC time is also known as 'Zulu' time, since 'Zulu' is the NATO phonetic alphabet word for 'Z'.

Examples

<time>Z
<time>±hh:mm
<time>±hhmm
<time>±hh

As of ISO-8601, the results should be one of the following (configurable?):

• 20160104T204256,048Z
• 20160104T204256,048+00:00
• 20160104T204256,048+0000
• 20160104T204256,048+00

Another reference: http://stackoverflow.com/questions/833102/wheres-the-datetime-z-format-specifier