When Was The Metamorphosis Written?

Franz Kafka, a Prague Jew who wrote in German, published almost no works during his lifetime, only excerpts from the novels The Trial (1925) and The Castle (1926) and a few short stories. The most remarkable of his short stories, Metamorphosis, was written in the autumn of 1912 and published in 1915. The short story did not attract the attention of contemporaries and in general, Kafka's work found its reader only after his death, as during his life the writer was practically not known.
However, by the middle of the twentieth century, The Metamorphosis had gained not only a reader, but also a viewer, since the first film adaptation was filmed in the 1950s.
The plot of "Metamorphosis" is based on the grotesque and absurd story of a simple salesman Gregor Samza, who one day woke up as a huge insect. The reader, like Gregor himself, is unaware of the circumstances and causes of these metamorphoses.