As reported by Piotr in #1416
<https://github.com/apache/logging-log4j2/issues/1416> (and causing the JTL
issue in #1420 <https://github.com/apache/logging-log4j2/issues/1420>),
certain formatting identifiers are interpreted differently between
`FixedDateFormat`, `FastDateFormat`, and Java's `DateTimeFormatter`. I
propose the following *breaking change* for `2.x`: follow DTF syntax
everywhere and introduce a property to restore the old behaviour.
Objections?

(Please see #1416 <https://github.com/apache/logging-log4j2/issues/1416> for
the list of differences between formatters.)

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