Roman dates

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General Information

Roman dates are given by using references to three sacred days which fall at roughly the same time each month. These days are the Kalends, the Nones, and the Ides. These will be returned to again, shortly.

Dates are given by counting, inclusively, backwards from the next reference day, putting this number, ordinally, in the accusative case, after the words "ante diem," excepting one case, which is the day before the referenced day, in which case rather than the number and "ante diem," the word "pridie" is used instead. Usually, instead of writing each word out, the words "ante diem" are abbreviated to "a.d.," "pridie" is abbreviated to "pr.," and the number is just given as a numeral. Following this, the referenced sacred day and month is placed in the feminine accusative plural.

Kalends, Nones, and Ides

The Kalends ("Kalendae", in Latin; abbr. "Kal.") always fall on the first day of the month. The Nones (Nonae, "Non.") fall mostly on the 5th, but on the 7th in March, May, July, and October. The Ides (Idus, "Id.") fall mostly on the 13th, but on the 15th in those months just mentioned.

Therefore, to refer to the 29th of January, for instance, the date would be "ante diem quartum Kalendas Februarias (a.d. IV Kal. Feb.)," literally translated to "the fourth day before the February Kalends (usually reckoned as "Kalends of 'month'"). Similarly, the 14th of March: "pridie Idus Martias (pr. Id. Mar.)," i.e., "the day before the March Ides."

But there is an exception. When the date to be give in one of these three sacred days (Kalends, Nones, Ides), the date is given as strictly the day and month, both in the feminine ablative plural. Therefore, "Kalendis Aprilibus," "Nonis Septembribus," "Idibus Maiis."


Years are given in one of two ways: either with reference to the year's consuls, or with reference to the year of the founding of the City.

Consular dating

When using Consular dating the names of both consuls are given in the ablative case, followed by the word "consulibus (cos.)." So, 63 BCE would be "M. Tullio Cicerone et C. Antonio Hibrida consulibus." Also, it was not uncommon to shorten this simply to the cognomina of the two consuls, so the previous would be "Cicerone et Hibrida cos."

Dating from the founding of the city

When using reference to the founding of the City (i.e., Rome), the accepted date is 753 BCE, which would make the year 2001, for instance, "2754." This number is given, followed by the words "anno Urbis conditae" or "ab Urbe condita" ("in the year of the founding of the City" or "from the City being Founded"), both abbreviated "a.u.c."

Month Forms

The table below gives the necessary forms for giving Roman dates. The pre-Julian Latin name and forms are only given when in disagreement with the Gregorian equivalents.

Month (English, Gregorian Latin, pre-Julian Latin) Plural Forms (Accusative, Ablative) Month (English, Gregorian Latin, pre-Julian Latin) Plural Forms (Accusative, Ablative) Month (English, Gregorian Latin, pre-Julian Latin) Plural Forms (Accusative, Ablative)
January, Ianuarius Ianuarias, Ianuariis May, Maius Maias, Maiis September, September Septembres, Septembribus
February, Februarius Februarias, Februariis June, Iunius Iunias, Iuniis October, October Octobres, Octobribus
March, Martius Martias, Martiis July, Iulius, Quin[c]tilis Iulias, Iuliis; Quin[c]tiles, Quin[c]tilibus November, November Novembres, Novembribus
April, Aprilis Apriles, Aprilibus August, Augustus, Sextilis Augustas, Augustis; Sextiles, Sextilibus December, December Decembres, Decembribus

Table of Dates

Februarius Februarius
(leap year)
1 Kalendis Kalendis Kalendis Kalendis
2 a.d. IV Non. a.d. IV Non. a.d. VI Non. a.d. IV Non.
3 a.d. III Non. a.d. III Non. a.d. V Non. a.d. III Non.
4 pridie Nonas pridie Nonas a.d. IV Non. pridie Nonas
5 Nonis Nonis a.d. III Non. Nonis
6 a.d. VIII Id. a.d. VIII Id. Pridie Nonas a.d. VIII Id.
7 a.d. VII Id. a.d. VII Id. Nonis a.d. VII Id.
8 a.d. VI Id. a.d. VI Id. a.d. VIII Id. a.d. VI Id.
9 a.d. V Id. a.d. V Id. a.d. VII Id. a.d. V Id.
10 a.d. IV Id. a.d. IV Id. a.d. VI Id. a.d. IV Id.
11 a.d. III Id. a.d. III Id. a.d. V Id. a.d. III Id.
12 pridie Idus pridie Idus a.d. IV Id. pridie Idus
13 Idibus Idibus a.d. III Id. Idibus
14 a.d. XIX Kal. a.d. XVI Kal. pridie Idus a.d. XVIII Kal.
15 a.d. XVIII Kal. a.d. XV Kal. Idibus a.d. XVII Kal.
16 a.d. XVII Kal. a.d. XIV Kal. a.d. XVII Kal. a.d. XVI Kal.
17 a.d. XVI Kal. a.d. XIII Kal. a.d. XVI Kal. a.d. XV Kal.
18 a.d. XV Kal. a.d. XII Kal. a.d. XV Kal. a.d. XIV Kal.
19 a.d. XIV Kal. a.d. XI Kal. a.d. XIV Kal. a.d. XIII Kal.
20 a.d. XIII Kal. a.d. X Kal. a.d. XIII Kal. a.d. XII Kal.
21 a.d. XII Kal. a.d. IX Kal. a.d. XII Kal. a.d. XI Kal.
22 a.d. XI Kal. a.d. VIII Kal. a.d. XI Kal. a.d. X Kal.
23 a.d. X Kal. a.d. VII Kal. a.d. X Kal. a.d. IX Kal.
24 a.d. IX Kal. a.d. VI Kal. a.d. IX Kal. a.d. VIII Kal.
25 a.d. VIII Kal. a.d. V Kal. a.d. bis VI Kal. a.d. VIII Kal. a.d. VII Kal.
26 a.d. VII Kal. a.d. IV Kal. a.d. V Kal. a.d. VII Kal. a.d. VI Kal.
27 a.d. VI Kal. a.d. III Kal. a.d. IV Kal. a.d. VI Kal. a.d. V Kal.
28 a.d. V Kal. pridie Kalendis a.d. III Kal. a.d. V Kal. a.d. IV Kal.
29 a.d. IV Kal. (-) pridie Kalendis a.d. IV Kal. a.d. III Kal.
30 a.d. III Kal. (-) (-) a.d. III Kal. pridie Kalendis
31 pridie Kalendis (-) (-) pridie Kalendis (-)


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