When did shakespeare write sonnet 18?

The exact date when William Shakespeare wrote Sonnet 18 is not known with certainty. However, scholars generally believe that Shakespeare wrote most of his sonnets during the period between 1593 and 1609. Based on stylistic and thematic analysis, it is believed that Sonnet 18 was likely written sometime within this period. Shakespeare's sonnets were first published in a collection in 1609, titled "Shakespeare's Sonnets."