A Biblical year is 360 days. A unit of 7 is 7 years and there is 7 units for 49 years. 49 years x 360 = 17,640.

"From the going forth of the word to restore and build Jerusalem there shall be seven sets of seven [49 years]" (Dan. 9.25). This prophecy already occurred but is fulfilled again as you can see how it would naturally pertain to when Israel reclaims Jerusalem for the final Jubilee of 50 years and completion of the Temple. This is what Isaac Newton believed also in his literature for a double fulfillment.

Using the Gregorian Calendar from June 7, 1967 when Israel reclaimed Jerusalem to Sept. 23, 2015, the Day of Atonement, is exactly 17,640 days also, including leap years and regular years. The Day of Atonement pertains to salvation and judgment upon the nations (Matt. 25.31-46). 5 days later is the 4th Total Lunar Eclipse in the Tetrad on Sept. 28, 2015, the Feast of Tabernacles, the last of the 7 feasts which ushers in the Day of the Lord. The Tribulation ensues for 7 years then the millennial kingdom starts.

http://www.timeanddate.com/date/dura...015&h2=&i2=&s2=

http://www.youtube.com/user/Xenetos#p/u/217/zFGDKqeEnjw