this one goes way back, before it became colloquial southrin (or wherever).
52. {of take up pages and pages :}
a. At some time during, in the course of, on.
App. taking the place of the Com. Teut. and OE. genitive of time. Now only in the colloquial of an evening, of a morning, of a Sunday afternoon, and the like.
... 1382 Wyclif Gen. xx. 8 Anoon of the nyŠt 1590 Shakes. Mids. N. ii. i. 253 There sleepes Tytania, sometime of the night. 1612 Acct.-bk. W. Wray in Antiquary XXXII. 214 Great thunder+and also the like of new yeares day following. 1657 Manchester Court Leet Rec. (1887) IV. 212 For buying and selling pullen both of one day. 1741 Richardson Pamela II. 149 Of a Thursday my dear Father and Mother were marry'd. 1741 C'tess Pomfret Corr. (1805) III. 178 Here the company meet of a summer's evening. 1830 J. H. Newman Lett. (1891) I. 222 My practice to walk of a day to Nuneham. 1831 Carlyle Sart. Res. i. iii, All the Intellect of the place assembled of an evening. 1899 W. J. Knapp Life Borrow I. 79 The father made his last Will and Testament of a Monday.
