One thing I get a kick out of when some people try to predict prophesy is that they often use the Solar calendar to set their predicted date. I am quite confident if one tries to use that, their dates will always be wrong. I doubt anyone can predict a date anyway.
The Biblical calendar is lunar in nature, and agricultural in specific timing.
The barley growing in the Kidron must be sufficiently developed to be made into flour 14 days later for the year to begin.
For this reason, dates cannot be projected years in advance. Human inspection of a real crop is the only way to know.