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Rule "in January 1 (on January 1)"

This is one of many errors that LanguageTool can detect.

Description: in January 1 (on January 1)
Message: Did you mean <suggestion>on \2</suggestion>? This seems to be a day date.
Category: Possible Typo (ID: TYPOS)
Link: https://languagetool.org/insights/post/in-on-at-grammar/#using-%E2%80%9Cin%E2%80%9D-%E2%80%9Con%E2%80%9D-and-%E2%80%9Cat%E2%80%9D-as-prepositions-of-time
Incorrect sentences
that this rule can detect:
  • In February 21, we ate the poison.
    Correction suggestion: On February
Correct sentences
for comparison:
  • Cuba Gooding Jr. was born on January 2, 1968.
  • The following events occurred in January 1900.
  • In October 37 AD, Caligula fell seriously ill.
  • In March 37, Tiberius died and Agrippina's remaining son Caligula succeeded as emperor.
ID: IN_JANUARY [1]
Version: 6.6-SNAPSHOT (2024-11-22 22:33:09 +0100)