'In that Day' in the Bible

But the days will come, when the bridegroom shall be taken away from them, and then will they fast in that day.

And it happened that Jesus was walking through the grainfields on the Sabbath day and His disciples began picking off heads of grain [to eat] as they traveled along. [Note: It was an accepted custom for people in that day to be permitted to do this as they walked along the paths bordering a grainfield].

And he says to them in that day, being evening, Let us go beyond.

They placed a purple robe on Him [Note: Matt. 27:28 calls this a "scarlet" robe. In that day, any color with a mixture of "red" in it was often called "purple"], and making a wreath out of thorns, they placed it on His head.