I'm afraid you're thinking of Seventh Day Adventists, who were the result of the 1844 Great Disappointment of the Millerite movement after the predicted apocalypse didn't happen.

https://en.wikipedia.org/wiki/Great_Disappointment

Now here's the truly weird part:

Members of the Baháʼí Faith believe that Miller's interpretation of signs and dates of the coming of Jesus were, for the most part, correct.[39] They believe that the fulfillment of biblical prophecies of the coming of Christ came through a forerunner of their own religion, the Báb, who declared that he was the "Promised One" on May 23, 1844, and began openly teaching in Persia in October 1844.[40][41] Several Baháʼí books and pamphlets make mention of the Millerites, the prophecies used by Miller and the Great Disappointment, most notably Baháʼí follower William Sears' Thief in the Night.[42][43][44]

It was noted that the year AD 1844 was also the Year AH 1260. Sears tied Daniel's prophecies in with the Book of Revelation in the New Testament in support of Baháʼí teaching, interpreting the year 1260 as the "times, time and half a time" of Daniel 7:25 (3 and 1/2 years = 42 months = 1,260 days). Using the same day-year principle as did William Miller, Sears decoded these texts into the year AH 1260, or 1844.[42]

It is believed by Baháʼís that if William Miller had known the year 1844 was also the year AH 1260, then he may have considered that there were other signs to look for. The Baháʼí interpretation of chapters 11 and 12 of the Book of Revelation, together with the predictions of Daniel, were explained by 'Abdu'l-Bahá, the son of the founder of the Baháʼí Faith, to Laura Clifford Barney and published in 1908 in Chapters 10, 11 and 13 of "Some Answered Questions". The explanation provided in Chapter 10 draws on the same biblical verses that William Miller used, and comes to the same conclusion about the year in which to expect the 'cleansing of the sanctuary' which was interpreted by 'Abdu'l-Bahá to be the 'dawn' of a new 'Revelation' – AD 1844.[citation needed]