How do you explain Matthew 24:36 says Christ did not know the time of his own coming again to earth?

Again, this must be explained by understanding the union of human and divine in Christ. Christ was one person with two natures. His person came directly from God, but his human nature (including his physical brain) came from Mary. The divine nature “fed” facts to the human brain incrementally, so that it may rightly be said that Jesus “learned obedience” (Heb 5:8) and “increased in wisdom” (Luke 2:52) as he grew up. Matthew 24:36 can best be explained by understanding that the logos had not yet placed the information about the second coming in Jesus’ physical brain.