Dates using Roman numerals.

1	i	2	ij	3	iij	4	iv	5	v	6	vi	7	vij	8	viij	9	ix	10	x	11	xi
12	xij	13	xiij	14	xiv	15	xv	16	xvi	17	xvij	18	xviij	19	xix	20	xx	21	xxi	22	xxij
23	xxiij	24	xxiv	25	xxv	26	xxvi	27	xxvij	28	xxviij	29	xxix	30	xxx	31	xxxi

JANUARIUS, FEBRUARIUS, MARTIUS, APRILIS, MAIUS, JUNIUS, JULIUS, AUGUSTUS, SEPTEMBER, OCTOBER, NOVEMBER, DECEMBER.

or as they are more correctly written as Romans did not have a 'J' or a 'U' in their alphabet

IANVARIVS, FEBRVARIVS, MARTIVS, APRILIS, MAIVS, IVNIVS, IVLIVS, AVGVSTVS, SEPTEMBER, OCTOBER, NOVEMBER, DECEMBER.

Fortunately the Romans abbreviated them and you can safely use the first three letters followed by a stop, except that Mart. and Sept. is more usually used.