In Mark 13:32 Jesus tells us when he will come:

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"But of the day and hour no one knows, not even the angels in heaven, nor the Son, but only the Father. Take heed, watch and pray; for you do not know when the time is."

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"Its like a man going to a far counrty, who left his house and gave authority to this servants, and to each his work, and commanded the doorkeeper to watch. Watch therefore, for you do not know when the master of the house is coming- in the evening, at midnigt, at the crowing of the rooster, or in the morning- Lest, coming suddenly, he find you sleeping. And what I say to you, I say to all. Watch!"