In the book Story of My Life, when was the account of Helen Keller's "Most Important Day" written?

The short story "The Most Important Day" is actually taken from Helen Keller's autobiography, entitled The Story of My Life.  Ms. Keller wrote her autobiography at the age of twenty-two, when she was in her second year at Radcliffe College.  The book was first published in 1902.

In The Story of My Life, the author chronicles the events of her life to the time of writing.  The first half of the book, from which "The Most Important Day" is taken, is a collection of personal vignettes about Ms. Keller from her earliest recollections to her entrance into college.  The vignettes are very personal, and appear in no chronological order.  The second half of the book recounts events from her two years at Radcliffe.

Before it was published as a complete work, The Story of My LIfe appeared in installments in The Ladies' Home Journal.  Ms. Keller wrote the book with the help of John Albert Macy, a Harvard professor and editor who later married Ms. Keller's "first teacher and lifelong companion, Anne Sullivan.