According to at-Tabari Muhammad believed that the end of the world was to occur 500 years after his coming:
Book 41, Number 7044:
Accordingly, the world should have ended sometime between 1070-1132 AD, approximately 500 years after the birth and death of Muhammad. This is based on the fact that according to at-Tabari and others, the advent of Muhammad took place approximately 6,500 years from the time of creation. This is clearly a false prophecy.
"According to Hannad b. al-Sari and Abu Hisham al-Rifa'i- Abu Bakr b. 'Ayyash- Abu Hasin- Abu Salih- Abu Hurayrah: The Messenger of God said: When I was sent (to transmit the divine message), I and the Hour were like these two, pointing at his index and middle fingers." (Tabari, p. 176; emphasis ours, see also pp. 175-181)
Similar traditions are found in Sahih Muslim:Book 41, Number 7044:
This hadith has been reported by Sahl b. Sa'd that he heard Allah's Messenger (may peace be upon him) as saying: I and the Last Hour are (close to each other) like this (and he, in order to explain it) pointed (by joining his) forefinger, (one) next to the thumb and the middle finger (together).
Book 41, Number 7046:Shu'ba reported: I heard Qatada and Abu Tayyab narrating that both of them heard Anas as narrating that Allah's Messenger (may peace be upon him) said: I and the Last Hour have been sent like this, and Shu'ba drew his forefinger and middle finger near each other while narrating it.
Book 41, Number 7049:Anas reported Allah's Messenger (may peace be upon him) as saying: I and the Last Hour have been sent like this and (he while doing it) joined the forefinger with the middle finger.
At-Tabari comments on the meaning of the Hour being as close as Muhammad's index and middle fingers:"Thus, (the evidence permitting) a conclusion is as follows: The beginning of the day is the rise of the dawn, and its end is the setting of the sun. Further, the reported tradition on the authority of the Prophet is sound. As we have mentioned earlier, he said after having prayed the afternoon prayer: What remains of this world as compared to what has passed of it is just like what remains of this day as compared to what has passed of it. He also said: When I was sent, I and the Hour were like these two- holding index finger and middle finger together; I preceded it to the same extent as this one- meaning the middle finger- preceded that one- meaning the index finger. Further, the extent (of time) between the mean time of the afternoon prayer- that is, when the shadow of everything is twice its size, according to the best assumption ('ala al-taharri)- (to sunset) is the extent of time of one-half of one-seventh of the day, give or take a little. Likewise, the excess of the length of the middle finger over the index finger is something about that or close to it. There is also a sound tradition on the authority of the Messenger of God, as I was told by Ahmad b. 'Abd al-Rahman b. Wahb- his paternal uncle 'Abd-allah b. Wahb- Mu'awiyah b. Salih- 'Abd al-Rahman b. Jubayr b. Nufayr- his father Jubayr b. Nufayr- the companion of the Prophet, Abu Tha'labah al-Khushani: The Messenger of God said: Indeed, God will not make this nation incapable of (lasting) half a day- referring to the day of a thousand years.
"All these facts taken together make it clear that of the two statements I have mentioned concerning the total extent of time, the one from Ibn Abbas, and the other from Ka'b, the one more likely to be correct in accordance with the information coming from the Messenger of God is that of Ibn 'Abbas transmitted here by us on his authority: The world is one of the weeks of the other world - seven thousand years.
"Consequently, because this is so and the report on the authority of the Messenger of God is sound- namely, that he reported that what remained of the time of this world during his lifetime was half a day, or five hundred years, since five hundred years are half a day of the days, of which one is a thousand years- the conclusion is that the time of this world that had elapsed to the moment of the Prophet's statement corresponds to what we have transmitted on the authority of Abu Tha'labah al-Khushani from the Prophet, and is 6,500 years or approximately 6,500 years. God knows best!" (Tabari, pp. 182-183, bold emphasis ours)
Hence, according to these traditions Muhammad believed that not only was the world less than 7,000 years old but it was to end on the seventh day, or seven thousand years from the time it was created."All these facts taken together make it clear that of the two statements I have mentioned concerning the total extent of time, the one from Ibn Abbas, and the other from Ka'b, the one more likely to be correct in accordance with the information coming from the Messenger of God is that of Ibn 'Abbas transmitted here by us on his authority: The world is one of the weeks of the other world - seven thousand years.
"Consequently, because this is so and the report on the authority of the Messenger of God is sound- namely, that he reported that what remained of the time of this world during his lifetime was half a day, or five hundred years, since five hundred years are half a day of the days, of which one is a thousand years- the conclusion is that the time of this world that had elapsed to the moment of the Prophet's statement corresponds to what we have transmitted on the authority of Abu Tha'labah al-Khushani from the Prophet, and is 6,500 years or approximately 6,500 years. God knows best!" (Tabari, pp. 182-183, bold emphasis ours)
Accordingly, the world should have ended sometime between 1070-1132 AD, approximately 500 years after the birth and death of Muhammad. This is based on the fact that according to at-Tabari and others, the advent of Muhammad took place approximately 6,500 years from the time of creation. This is clearly a false prophecy.