Let's begin by looking at the verse in question: Jesus says in Mark 13:32 "But of that day, and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father."  (Compare with Matthew 24:36)

In these verses, Jesus said plainly that at that time, He did not know the exact timing of His second coming.  But why would Christ say this if He truly was equal with His Father?  An answer to this can be found in Philippians 2 verse 7, where it tells us that Jesus "made Himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men".  We don't want to speculate, but it seems that Christ intentionally and temporarily laid aside certain elements of His power when He took on human form (Hebrews 2:14-18).  We can see this all throughout the Gospels, as Christ was constantly depending upon His Father for help.
(See John 5:19 & 30)

Since Jesus has now been resurrected and is once again reigning in heaven with His Father, doesn't it make since that He now knows the full details about His return?   We know this is true because of what He specifically said to John in Revelation 22:12-13 "Behold, I come quickly; and my reward is with me, to give every man according as his work shall be. I am Alpha and Omega, the beginning and the end, the first and the last."

Yes, we can be sure that Christ is all knowing and omniscient!  Colossians 1:16-17 speaks of Jesus when it says: "For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him: And he is before all things, and by him all things consist."