The Bible says no one knows the time of the end. The Bible also never gives any context for the periods of time meant. It could be 7 years, 70, or it could be 7,000 years. Biblical prophecies do not tend to unfold in a sequence of time easily seen by one generation. FWIW, just my opinion/read of the Bible.
Theres an interesting book called "The Bible Code" id recommend reading. Also, a good close scan of Revelation and of Daniel give many clues about the end of time. Youre right, the time is not clear. Although it may be in there somewhere. Xx
Actually the Bible, specifically Jesus says no one knows the DAY or HOUR... but I believe we can know the general time. That is why God gives all the signs in Matthew 24.