context: In 1900, Hofman became acquainted with a participant of the Salvation Army from The Hague, Jacoba Maria Stolk, who officially became his fiancé the following year. Maria also wanted to help Hofman in serving the Mission, and once she knew what kind of assignment she was going to undertake, she began to prepare herself by practicing Malay, taking a nursing course and continuing her work as a teacher. When Hofman learned that he would be stationed in Central Sulawesi, he immediately sent a letter to the missionary Albertus Christiaan Kruyt, who would be his partner there. [3]
question: When did Philip Heinrich Christoph Hofman start to become a Dutch missionary?
answers.text: 1900