For the record, the Most Holy Trinity, Father, Son and Holy Spirit existed from all time and will have no end.
The second person of that Trinity, the Son, became incarnate in the womb of the Virgin Mary and was given the name Jesus, according to the instruction of the angel.
The Incarnation was a historical event and Jesus was a historical person.
Jesus has a birthday. We celebrate it at Christmas. We also celebrate the day of His conception; the day when the Angel Gabriel appeared to Mary and asked for her agreement to God's plan. It's called "The Annunciation" in the Catholic Church.
Prior to the Son taking on human form and coming to Earth, there was no Jesus.
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Time is part of the Creation, not a property or restriction on the Creator.
For instance, Jesus is the Lamb slain from the foundation of the world. He is always the Lamb of God, thus His sacrifice is perfection. Unlike the blood of a mere mortal, His blood never fades, never fails, never runs out.
And I beheld, and, lo, in the midst of the throne and of the four beasts, and in the midst of the elders, stood a Lamb as it had been slain, having seven horns and seven eyes, which are the seven Spirits of God sent forth into all the earth. - Revelation 5:6
For by one offering he hath perfected for ever them that are sanctified. - Hebrews 10:14
Notwithstanding translations, the bottom line is that God's Name I AM is Truth regardless of when, or in what language, He announced that Name to us mere time-bound mortal creatures.
To God be the glory, not man, never man.