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When did the period called modern logic conventionally begin and end?

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logic: universal affirmative — Modern logic Representations of the universal affirmative, “All A's are B's” in modern logic.

In the history of Western philosophy, the period of modern logic is conventionally defined as beginning with the start of the Renaissance and extending through the end of the 19th century, reaching toward the turn of the 20th century.12

This era was not characterized by a unified or smooth progression of thought. Instead, it was marked by extreme diversity and a chaotic development that mirrored the significant political and intellectual upheavals of the time, including the Scientific Revolution, the Reformation, and the growth of modern mathematics. A distinguishing characteristic of this period was the increasing effort to apply symbolic notation to logical systems, a practice inspired by the successes found in mathematics.123