Where Jehovah witnesses ever part of the seven day adventist?

Answer 1

No.

The one who founded the Watchtower Bible and Tract Society (on of the main legal entity of Jehovah's Witnesses), Charles Russell, was raised as a Presbyterian, and later joined the Congregationalist Church, but then he quickly became unsatisfied with many of the explanations that church offered. At some point in his life, in searching for the truth, he also found the teachings of a man named Jonas Wendell, a preacher for the Second Adventists Church, intriguing, but never actually joined the church. Later, Russell recalled this when he said:

"Seemingly by accident, one evening I dropped into a dusty, dingy hall, where I had heard religious services were held, to see if the handful who met there had anything more sensible to offer than the creeds of the great churches. There, for the first time, I heard something of the views of Second Adventists [Advent Christian Church], the preacher being Mr. Jonas Wendell . . . Thus, I confess indebtedness to Adventists as well as to other denominations. Though his Scripture exposition was not entirely clear, . . . it was sufficient, under God, to re-establish my wavering faith in the divine inspiration of The Bible, and to show that the records of the apostles and prophets are indissolubly linked. What I heard sent me to my Bible to study with more zeal and care than ever before, and I shall ever thank the Lord for that leading; for though Adventism helped me to no single truth, it did help me greatly in the unlearning of errors, and thus prepared me for the Truth."

At the age of 23, Russel began a joint venture to publish a monthly magazine called "The Herald of the Morning" with an Adventist (not a Seventh-day Adventist) named Nelson Barbour, who had previously published a magazine by the same name, but gave up due to lack of public support and exhausted funds. But only about a year later, due to severe disagreements between Russell and Barbour, Russell left off support of the publication, and in July 1879, Russell founded his own publication called "Zion's Watchtower and Herald of Christ's Presence," now known as the "The Watchtower Announcing Jehovah's Kingdom."

So, even though Russell had association with some members of Adventism, he never joined any of Adventist church sects, nor fully subscribed to all of the ideas of the Adventists. That period of his life could be described as a searching for truth.

Answer 2

No. Jehovah's Witnesses were founded by Charles T Russel in the 1800s.

Seven Day Adventist have far different ideas about God.