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Incorrect 'DateTimeFormat' pattern

Reports incorrect date time format patterns.

The following errors are reported:

  • Unsupported pattern letters, like "TT"

  • Using reserved characters, like "#"

  • Incorrect use of padding

  • Unbalanced brackets

  • Incorrect amount of consecutive pattern letters


DateTimeFormatter.ofPattern("[][]]"); // Closing ']' without previous opening '[' DateTimeFormatter.ofPattern("TT"); // Illegal pattern letter 'T' DateTimeFormatter.ofPattern("{"); // Use of reserved character '{' DateTimeFormatter.ofPattern("MMMMMM"); // Too many consecutive pattern letters 'M'

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Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Probable bugs

New in 2022.3


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024