Or, read up a bit. The OP has only posted half the verse. The entire verse reads:
The subject and timeframe for this promise are both very specific - and (in context) it clearly applies to the Apostles on Judgment day.
Sorry, brother, it does not apply to you at all (nor to me). Jesus was speaking to the Apostles, not to us.
I thought the time frame and context was when they see Jesus risen, and then after he Ascends and they are waiting for him to return in glory. In otherwords, they are not to question and interrogate him when they see him risen, but they may petition the Father for their needs.
CCC 2614 When Jesus openly entrusts to his disciples the mystery of prayer to the Father, he reveals to them what their prayer and ours must be, once he has returned to the Father in his glorified humanity. What is new is to “ask in his name.” Faith in the Son introduces the disciples into the knowledge of the Father, because Jesus is “the way, and the truth, and the life.” Faith bears its fruit in love: it means keeping the word and the commandments of Jesus, it means abiding with him in the Father who, in him, so loves us that he abides with us. In this new covenant the certitude that our petitions will be heard is founded on the prayer of Jesus.
CCC 2615 Even more, what the Father gives us when our prayer is united with that of Jesus is “another Counselor, to be with you for ever, even the Spirit of truth.” This new dimension of prayer and of its circumstances is displayed throughout the farewell discourse. In the Holy Spirit, Christian prayer is a communion of love with the Father, not only through Christ but also in him: “Hitherto you have asked nothing in my name; ask, and you will receive, that your joy may be full.”