Ah, Fridolin sweetie! You finally managed a semi-coherent reply. Therefore I will reply.
: Regarding the Persians, it all depends on how long did Persians to come into power.
You tell me, Fridolin: just "how long did Persians to come into power"?
To NewYork44M:
The "zero year" problem was first dealt with in the 1943 book The Truth Shall Make You Free, page 239. In this book, the 606 date for the beginning of the Gentile times was moved back to 607, using a completely ridiculous explanation. Unfortunately they forgot to move back the destruction of Jerusalem to 607, so between summer 1943 and summer 1944 or so, they taught that the Gentile times began ten months before Jerusalem was destroyed. This stupid error was fixed in the 1944 book The Kingdom Is At Hand, around pages 171 onward. In a footnote, they claimed that Jerusalem's destruction was moved back in the 1943 book, but that is a flat out lie. They simply changed the date in the chronological chart in the 1944 book. On page 105 of the Revelation Climax book you can find a rather misleading comment about the 1943 change, but no mention of the 1944 change.
In succeeding years, further minor explanations were set forth in WTS publications. The most extensive were in 1952 and 1955 Watchtower articles. You can find my fairly complete writeups on this in three articles dealing with "606 to 607" here: http://www.geocities.com/osarsif/index2.htm .
AlanF