The Branch Davidian group descends from the Seventh Day Adventist, who were inspired by the teachings of William Miller in regard 1844.
Other Adventists groups were also inspired from William Miller's teachings. One of these was Second Adventist Nelson Barbour, who came up with 1914. Barbour convinved Russell of his groups chronology and Russell began working for his magazine, until 1879 when Russell broke away and formed his own group.
Many of these groups have similar terminology. New Light. Present Truth. And so forth.