אַתָּ֣ה תָ֭קוּם תְּרַחֵ֣ם צִיּ֑וֹן כִּי־עֵ֥ת לְ֝חֶֽנְנָ֗הּ כִּי־בָ֥א מוֹעֵֽד׃
דו װעסט אױפֿשטײן און זיך דערבאַרימען אױף צִיון, װאָרום עס איז צײַט זי צו לײַטזעליקן, װאָרום געקומען איז די שעה.
Rashi
On your walls, O Jerusalem Our Rabbis expounded it according to its apparent meaning as referring to the angels who remind the Lord concerning its destruction, to build it. What do they say? (Ps. 102:14) “You shall rise, You shall have mercy on Zion”; (ibid. 132:13) “For the Lord has chosen Zion.” As is found in the Tractate Menahoth (87a, Rashi ad loc.). Jonathan, [however,] renders “your walls,” the early forefathers, who protect us like a wall.
Sefer Daniel; Opportunity in Exile
We suggest that the Mefarshim’s calculations are an expression of Tefilla to Hashem. They echo the beautiful Pasuk (Tehillim 102:14), where we ask Hashem to redeem us since the Moed/Keitz/appointed time of Ge’ulah has arrived. By setting forth the various dates for Mashiach’s ETA, we strengthen our plea that the time for the ultimate redemption has arrived.