There are those who unknowingly assume Jesus Christ is referring to our calendar when describing events and time lines in the Holy Bible.
 
Those who try to figure out a timeline for a 7 year tribulation (which I myself are guilty of) do so without considering  the definition of a "year" in the eyes of our creator.
 
So next time someone tries to come up with a 7 year tribulation/Daniel's 70th week timeline or base their studies on a calendar...consider what GOD recognize as a year and please do consider the following:
 
7 Lunar years?
7 Julian Years?
7 Enoch Years?
7 Sidereal Years?
7 Years of (360 days)?
7 Seasonal years (Gregorian)?
7 anomalistic years?
7 Draconic years?
7 Vague years?
7 Heliacal years?
7 Sothic years?
7 Gaussian years?
7 Besselian years?
 
All these years vary from a strictly Solar Calendar or a strictly Lunar Calendar or a LuniSolar Calendar. Maybe what the creator honors as a year isn't any of the above?
 
For more info, please go to wikipedia and type in "year" to get definitions of each and how long they are. I believe everyone needs to have a solid foundation in which to build a timeline.
 
What is your definition of a year as compared to GOD's definition of a year?
 
-Robert Rose