See Comments below charts for Explanation
The chart that accompanies this letter explains not only the 2300 days (evening and mornings) of Daniel 8:14 but also the 1,290 days and 1,335 days of Daniel 12:11-12. The 1,290 and 1,335 days of Dan. 12:11-12 actually help to fit more precisely the actual beginning and ending dates of the 2300 day period, although it is not necessary to fit Dan. 12:11 into Dan. 8:14 in order to sustain the interpretation of Dan. 12:11-12. McGuiggan likes my interpretation of Dan. 8:14 but not my interpretation of Dan. 12:11-12. I'll give you evidence for both briefly.
1. A basic mistake made by many commentators is to limit the vision to the period from the setting up of the abomination of desolation to the cleansing and re-dedication of the Temple. This period is not 2300 days, but the 1,290 and 1,335 days of Dan. 12:11-12.
2. The vision of Dan.8 is complicated by the bad translation of tsadekin 8:14, translated "purified," "cleansed" and "restored." The NAS Bible shows the actual meaning of the word in its margin., "1. literally, vindicated." The 2300 days end not with the cleansing of the Temple or the re-dedication of the Temple but at the vindication of the Temple, which would not only include the cleansing and restoration but the punishment of those guilty
of desecration. That the punishment of the desecrater is included in the vision of the 2300 days is seen in the angel's interpretation of the vision in 8:25 where he predicts that the desecrater (Antiochus IV) will "be broken without human hands." The vision of the prophecy should thus end up with the death of Antiochus IV, rather than the re-dedication of the Temple. I Maccabees 6:15 places Antiochus's death (by the hand of God, through grief from his defeat in Jerusalem, 6: 8-15) in the 149th year of the Seleucid era, or 163 B.C.
3. The beginning of the 2300 day period did not start with the setting up of the abomination of desolation which occurred on the 15th day of the month Casleu Kisley (or about Dec. 15), in the 145th year (167 B.C.) according to I Mac. 1:20-28, more than two years before the setting up of the abomination of desolation (I Mac. 1:29-54). The vision embraces not only the desecration of the temple, but also the persecution of God's people. (Dan. 8:13 says both "the holy place and the host") God's people will be trampled down and Dan. 8:24 says "he will also destroy mighty men and the holy people." The desecration of God's Temple and the persecution of God's people began in the 143rd year (I Mac. 1:20), not in the 145th year (I Mac. 1:54). The Temple had been desecrated and the Jews persecuted for more than two years before the statue of Jupiter (Zeus) was set up and worshiped.
4. Thus the entire period of 2300 days began in 143 (169 B.C.) and ended in the year 149 (163B.C) some 6 1/3 years later, or 2300 days. Read I Maccabees for yourself to confirm this 2300 days as a historical account. The reason commentators have not seen this 2300 days is that they thought the time period had to be crowded in between the worship of Jupiter (Zeus) and the re-dedication of the Temple. They failed to see the vision begins with the desecration and persecution of the temple and ends with its vindication in the death of the desecrater. This fits exactly with what the angel said concerning the interpretation of the vision and it fits exactly with what I Maccabees says concerning this historical fulfillment.
The Chart below belongs to the 7th Day Adventist. They turn the days into years and end up with the date of 1844. This is another Study. Thanks, Ted Stewart