When is “this day” that Jesus was “begotten”? And how is this related to Jesus being called God’s “son”?

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In Psalm 2:7 the psalm refers to the day that Messiah was begotten:

Psa_2:7 I will declare the decree: the LORD hath said unto me, Thou
art my Son; this day have I begotten thee.

And twice that verse is quoted in the NT:

Act_13:33 God hath fulfilled the same unto us their children, in that
he hath raised up Jesus again; as it is also written in the second
psalm, Thou art my Son, this day have I begotten thee.

Heb_1:5 For unto which of the angels said he at any time, Thou art my
Son, this day have I begotten thee? And again, I will be to him a
Father, and he shall be to me a Son?

Was “this day” some time in eternity past; ie, “from everlasting”? Or is it referring to a day in history?

And how is this related to Jesus being God’s son?

Heb_1:5 For unto which of the angels said he at any time, Thou art my
Son, this day have I begotten thee? And again, I will be to him a
Father, and he shall be to me a Son?

Bonus:

Is this begetting that which is referred to by the fourth gospel?:

Joh_1:14 And the Word was made flesh, and dwelt among us, (and we
beheld his glory, the glory as of the only begotten of the Father,)
full of grace and truth. Joh_1:18 No man hath seen God at any time;
the only begotten Son, which is in the bosom of the Father, he hath
declared him. Joh_3:16 For God so loved the world, that he gave his
only begotten Son, that whosoever believeth in him should not perish,
but have everlasting life. Joh_3:18 He that believeth on him is not
condemned: but he that believeth not is condemned already, because he
hath not believed in the name of the only begotten Son of God.

And the Revelation?:

Rev_1:5 And from Jesus Christ, who is the faithful witness, and the
first begotten of the dead, and the prince of the kings of the earth.
Unto him that loved us, and washed us from our sins in his own blood,

Is this begetting that which is referred to in the Creed of Athanasius?:

“…22. The Son is of the Father alone; not made nor created, but
begotten…”

http://www.ccel.org/creeds/athanasian.creed.html