The interpretation timeline
Joel 2:32 Douay-Rheims

And it shall come to pass, that every one that shall call upon the name of the Lord shall be saved: for in mount Sion, and in Jerusalem shall be salvation, as the Lord hath said, and in the residue whom the Lord shall call.

A.D. 379 – 1871 8 witnesses 9 excerpts

Patristic

before A.D. 750
379
A.D.
Basil of Caesarea Patristic
c. A.D. 330–379
“Well then, someone will say, will the large number of Christians who do not keep all the commandments practice the observance of some of them in vain? In this connection, it is well to recall blessed Peter, who, after he had performed so many good actions and had been a recipient of such great blessings, was told, upon his being guilty of one lapse only: "If I do not wash you, you will have no part with me." I shall not point out that his act bore no signs of indifference or contempt but was a demonstration of honor and reverence. But, someone might say, it is written, "Everyone who calls on the name of the Lord shall be saved."”
Source
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“Return, then, to the Church, those of you who have wickedly separated yourselves. For He promises forgiveness to all who are converted, since it is written: "Whosoever shall call on the Name of the Lord shall be saved." And lastly, the Jewish people who said of the Lord Jesus, "He hath a devil," and "He casteth out devils through Beelzebub," and who crucified the Lord Jesus, are, by the preaching of Peter, called to baptism, that they may put away the guilt of so great a wickedness.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“But whether he or some partners of his error are with you—for they are too numerous to make it possible for us to hope they are not, and when they are not refuted they mislead others into their sect and increase so much that I do not know where they will break out next—we would rather see them cured in the body of the church than cut off from the body as rotten members, if necessity allows even that. We have to fear that others will be infected, if we spare their infection. But the mercy of our Lord is able rather to free them from disease, and no doubt he will do it if they note and hold faithfully to what is written: "Whoever shall call upon the name of the Lord shall be saved."”
Source
“When the holy apostle wished to show that the prophets had foretold the coming of those times when it should come to pass that all nations would believe in God, he cited the testimony that reads, "And it shall come to pass that everyone who calls on the name of the Lord shall be saved." For the name of God who has made heaven and earth used to be invoked among the Israelites only. The rest of the nations used to call upon deaf and dumb idols and were not heard by them; or they invoked demons and were heard to their own harm. "But when the fullness of time had come," then was fulfilled what had been foretold. "And it shall come to pass, that everyone who calls upon the name of the Lord shall be saved." Hence the Jews—even those of them who believed in Christ—begrudged the gospel of the Gentiles and maintained that the gospel of Christ ought not to be preached to the uncircumcised.”
Source
date
unknown
c. A.D. 550
“This is Joel the second in order who was privileged to prophesy concerning the mystery of the Lord Christ, for he speaks thus (chap. ii, 28-32): And it shall come to pass afterward that I will pour out my spirit upon all flesh; and your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions; and also upon the servants and upon the handmaids in those days will I pour out my spirit. And I will show wonders in the heavens and in the earth, blood and fire, and pillars of smoke. The sun shall be turned into darkness, and the moon into blood, before the great and terrible day of the Lord come. And it shall come to pass that whosoever shall call on the name of the Lord shall be delivered—a passage which the blessed Peter mentions in the Acts of the Apostles as having been fulfilled when the descent of the Holy Spirit upon the Apostles occurred on the day of Pentecost.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“And it shall come to pass that whoever shall call etc. as... said—And where did He say it? (Deut. 28:10), “And all the peoples of the earth shall see that the Name of the Lord is called on you.” [from Mechilta, Ex. 12:25] and among the survivors—And in the remnant that will remain. whom the Lord invites Heb. קֹרֵא, an expression of those invited to a banquet or to the service of the king, an expression of invitation.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And it shall come to pass, that whosoever shall call on the name of the Lord shall be delivered,.... Or "saved", as in Act 2:21; from those miseries and calamities before described, from the impending ruin and destruction of the city; and so it was, that those that believed in Christ, that were in the city, had an intimation of it beforehand, and removed from thence to a place called Pella (w), and so escaped being involved in the common calamity: though this also may be understood of a spiritual deliverance and salvation by Christ, from sin, Satan, and the world, and from the second death, and wrath to come, and out of the hands of every enemy; which such share in who call on the name of the Lord, pray to him for grace and mercy, life and salvation, through Christ; that have a spiritual knowledge of God in Christ, real and sincere desires after him, and trust and confidence in him, which this phrase supposes; and which also includes the whole worship of God, internal and external, performed in a spiritual and evangelical manner; see Rom 10:13; for in Mount Zion and in Jerusalem shall be deliverance, as the Lord hath said; either by this prophet, or some others before him; see Psa 14:7; this cannot be understood literally of Mount Zion and Jerusalem, unless it be of deliverance out of it; not in it, for Jerusalem was the seat of blood, confusion, and distress; but mystically of the church of Christ, often called Zion and Jerusalem, Heb 12:22; hither the deliverer came, here he is, and to be seen; from hence the word of the Lord came, the Gospel of salvation, which proclaims deliverance to the captives; here it is to be heard, met with, and found, Isa 2:3; and in the remnant whom the Lord shall call; not merely externally, by the outward ministry of the word; but internally, according to his purpose, and by his grace, powerfully and effectually, to the special blessings of grace here, and eternal glory hereafter: these are the remnant according to the election of grace; the little flock to whom God gives the kingdom; the few that enter in at the strait gate; the little city, and few men in it, delivered by the poor wise man; these share in the deliverance of Zion, and shall be certainly and completely saved, with an everlasting salvation. This may respect not only the remnant, or a small number of the Jews that believed in Christ, upon his first coming, and the preaching of the Gospel by his apostles, but the call and conversion of them in the latter day; which sense connects the words better with the following chapter. (w) Euseb. Eccl. Hist. l. 3. c. 5. p. 75. Next: Joel Chapter 3”
Source
1849
A.D.
1774–1849
“Call. Amid these fears, those who trust in the Lord shall have nothing to suffer. Cambyses could not execute his designs. But the prophet here alludes still more to the conversion of the Gentiles, Acts ii. 21., and Romans x. 13. Some returned from Babylon, as a figure of this great event. Only a few Jews embraced the faith. (Calmet) — Salvation. Septuagint, “shall be saved, as the Lord hath spoken, and the person preaching the gospel, whom the Lord hath called.” (Haydock) Bible Text & Cross-references: The prophet foretells the terrible day of the Lord: exhorts sinners to a sincere conversion: and comforts God’s people with promises of future blessings under Christ. 1 Blow ye the trumpet in Sion, sound an alarm in my holy mountain, let all the inhabitants of the land tremble: because the day of the Lord cometh, because it is nigh at hand. 2 A day of darkness, and of gloominess, a day of clouds and whirlwinds: a numerous and strong people as the morning spread upon the mountains: the like to it hath not been from the beginning, nor shall be after it even to the years of generation and generation. 3 Before the face thereof a devouring fire, and behind it a burning flame: the land is like a garden of pleasure before it, and behind it a desolate wilderness, neither is there any one that can escape it. 4 The appearance of them is as the appearance of horses, and they shall run like horsemen. 5 They shall leap like the noise of chariots upon the tops of mountains, like the noise of a flame of fire devouring the stubble, as a strong people prepared to battle. 6 At their presence the people shall be in grievous pains: all faces shall be made like a kettle. 7 They shall run like valiant men: like men of war they shall scale the wall: the men shall march every one on his way, and they shall not turn aside from their ranks. 8 No one shall press upon his brother: they shall walk every one in his path: yea, and they shall fall through the windows, and shall take no harm. 9 They shall enter into the city: they shall run upon the wall, they shall climb up the houses, they shall come in at the windows, as a thief. 10 At their presence the earth hath trembled, the heavens are moved: *the sun and moon are darkened, and the stars have withdrawn their shining. 11 And the Lord hath uttered his voice before the face of his army: for his armies are exceedingly great, for they are strong, and execute his word: *for the day of the Lord is great and very terrible: and who can stand it? 12 Now, therefore, saith the Lord: Be converted to me with all your heart, in fasting, and in weeping, and mourning. 13 And rend your hearts, and not your garments, and turn to the Lord your God: *for he is gracious and merciful, patient and rich in mercy, and ready to repent of the evil. 14 *Who knoweth but he will return, and forgive, and leave a blessing behind him, sacrifice and libation to the Lord your God? 15 Blow the trumpet in Sion, *sanctify a fast, call a solemn assembly, 16 Gather together the people, sanctify the church, assemble the ancients, gather together the little ones, and them that suck at the breasts: let the bridegroom go forth from his bed, and the bride out of her bride-chamber. 17 Between the porch and the altar the priests, the Lord’s ministers, shall weep, and shall say: Spare, O Lord, spare thy people: and give not thy inheritance to reproach, that the heathens should rule over them. Why should they say among the nations: Where is their God? 18 The Lord hath been zealous for his land, and hath spared his people. 19 And the Lord answered and said to his people: Behold I will send you corn, and wine, and oil, and you shall be filled with them: and I will no more make you a reproach among the nations. 20 And I will remove far off from you the northern enemy: and I will drive him into a land unpassable, and desert, with his face towards the east sea, and his hinder part towards the utmost sea: and his stench shall ascend, and his rottenness shall go up, because he hath done proudly. 21 Fear not, O land, be glad, and rejoice: for the Lord hath done great things. 22 Fear not, ye beasts of the fields: for the beautiful places of the wilderness are sprung, for the tree hath brought forth its fruit, the fig-tree, and the vine have yielded their strength. 23 And you, O children of Sion, rejoice, and be joyful in the Lord your God: because he hath given you a teacher of justice, and he will make the early and the latter rain to come down to you as in the beginning. 24 And the floors shall be filled with wheat, and the presses shall overflow with wine, and oil. 25 And I will restore to you the years which the locust, and the bruchus, and the mildew, and the palmer-worm have eaten; my great host which I sent upon you. 26 And you shall eat in plenty, and shall be filled: and you shall praise the name of the Lord your God, who hath done wonders with you, and my people shall not be confounded for ever. 27 And you shall know that I am in the midst of Israel: and I am the Lord your God, and there is none besides: and my people shall not be confounded for ever. 28 And it shall come to pass after this, *that I will pour out my spirit upon all flesh: and your sons and your daughters shall prophesy: your old men shall dream dreams, and your young men shall see visions. 29 Moreover, upon my servants and handmaids in those days I will pour forth my spirit. 30 And I will shew wonders in heaven; and in earth, blood, and fire, and vapour of smoke. 31 *The sun shall be turned into darkness, and the moon into blood: before the great and dreadful day of the Lord doth come. 32 And it shall come to pass, *that every one that shall call upon the name of the Lord, shall be saved: for in Mount Sion, and in Jerusalem shall be salvation, as the Lord hath said, and in the residue whom the Lord shall call.”
Source
1871
A.D.
1871
“call on . . . name of . . . Lord--Hebrew, JEHOVAH. Applied to Jesus in Rom 10:13 (compare Act 9:14; Co1 1:2). Therefore, Jesus is JEHOVAH; and the phrase means, "Call on Messiah in His divine attributes." shall be delivered--as the Christians were, just before Jerusalem's destruction, by retiring to Pella, warned by the Saviour (Mat 24:16); a type of the spiritual deliverance of all believers, and of the last deliverance of the elect "remnant" of Israel from the final assault of Antichrist. "In Zion and Jerusalem" the Saviour first appeared; and there again shall He appear as the Deliverer (Zac 14:1-5). as the Lord hath said--Joel herein refers, not to the other prophets, but to his own words preceding. call--metaphor from an invitation to a feast, which is an act of gratuitous kindness (Luk 14:16). So the remnant called and saved is according to the election of grace, not for man's merits, power, or efforts (Rom 11:5). Next: Joel Chapter 3”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.