Roman vs Modern date style conversion table
| Modern | Roman |
|---|---|
| Mar 1 | Kal. Mart. |
| Mar 2 | a.d. VI Non. Mart. |
| Mar 3 | a.d. V Non. Mart. |
| Mar 4 | a.d. IV Non. Mart. |
| Mar 5 | a.d. III Non. Mart. |
| Mar 6 | prid. Non. Mart. |
| Mar 7 | Non. Mart. |
| Mar 8 | a.d. VIII Id. Mart. |
| Mar 9 | a.d. VII Id. Mart. |
| Mar 10 | a.d. VI Id. Mart. |
| Mar 11 | a.d. V Id. Mart. |
| Mar 12 | a.d. IV Id. Mart. |
| Mar 13 | a.d. III Id. Mart. |
| Mar 14 | prid. Id. Mart. |
| Mar 15 | Id. Mart. |
| Mar 16 | a.d. XVII Kal. Apr. |
| Mar 17 | a.d. XVI Kal. Apr. |
| Mar 18 | a.d. XV Kal. Apr. |
| Mar 19 | a.d. XIV Kal. Apr. |
| Mar 20 | a.d. XIII Kal. Apr. |
| Mar 21 | a.d. XII Kal. Apr. |
| Mar 22 | a.d. XI Kal. Apr. |
| Mar 23 | a.d. X Kal. Apr. |
| Mar 24 | a.d. IX Kal. Apr. |
| Mar 25 | a.d. VIII Kal. Apr. |
| Mar 26 | a.d. VII Kal. Apr. |
| Mar 27 | a.d. VI Kal. Apr. |
| Mar 28 | a.d. V Kal. Apr. |
| Mar 29 | a.d. IV Kal. Apr. |
| Mar 30 | a.d. III Kal. Apr. |
| Mar 31 | prid. Kal. Apr. |
| Apr 1 | Kal. Apr. |
| Apr 2 | a.d. IV Non. Apr. |
| Apr 3 | a.d. III Non. Apr. |
| Apr 4 | prid. Non. Apr. |
| Apr 5 | Non. Apr. |
| Apr 6 | a.d. VIII Id. Apr. |
| Apr 7 | a.d. VII Id. Apr. |
| Apr 8 | a.d. VI Id. Apr. |
| Apr 9 | a.d. V Id. Apr. |
| Apr 10 | a.d. IV Id. Apr. |
| Apr 11 | a.d. III Id. Apr. |
| Apr 12 | prid. Id. Apr. |
| Apr 13 | Id. Apr. |
| Apr 14 | a.d. XVIII Kal. Mai. |
| Apr 15 | a.d. XVII Kal. Mai. |
| Apr 16 | a.d. XVI Kal. Mai. |
| Apr 17 | a.d. XV Kal. Mai. |
| Apr 18 | a.d. XIV Kal. Mai. |
| Apr 19 | a.d. XIII Kal. Mai. |
| Apr 20 | a.d. XII Kal. Mai. |
| Apr 21 | a.d. XI Kal. Mai. |
| Apr 22 | a.d. X Kal. Mai. |
| Apr 23 | a.d. IX Kal. Mai. |
| Apr 24 | a.d. VIII Kal. Mai. |
| Apr 25 | a.d. VII Kal. Mai. |
| Apr 26 | a.d. VI Kal. Mai. |
| Apr 27 | a.d. V Kal. Mai. |
| Apr 28 | a.d. IV Kal. Mai. |
| Apr 29 | a.d. III Kal. Mai. |
| Apr 30 | prid. Kal. Mai. |
| May 1 | Kal. Mai. |
| May 2 | a.d. VI Non. Mai. |
| May 3 | a.d. V Non. Mai. |
| May 4 | a.d. IV Non. Mai. |
| May 5 | a.d. III Non. Mai. |
| May 6 | prid. Non. Mai. |
| May 7 | Non. Mai. |
| May 8 | a.d. VIII Id. Mai. |
| May 9 | a.d. VII Id. Mai. |
| May 10 | a.d. VI Id. Mai. |
| May 11 | a.d. V Id. Mai. |
| May 12 | a.d. IV Id. Mai. |
| May 13 | a.d. III Id. Mai. |
| May 14 | prid. Id. Mai. |
| May 15 | Id. Mai. |
| May 16 | a.d. XVII Kal. Iun |
| May 17 | a.d. XVI Kal. Iun |
| May 18 | a.d. XV Kal. Iun |
| May 19 | a.d. XIV Kal. Iun |
| May 20 | a.d. XIII Kal. Iun |
| May 21 | a.d. XII Kal. Iun |
| May 22 | a.d. XI Kal. Iun |
| May 23 | a.d. X Kal. Iun |
| May 24 | a.d. IX Kal. Iun |
| May 25 | a.d. VIII Kal. Iun |
| May 26 | a.d. VII Kal. Iun |
| May 27 | a.d. VI Kal. Iun |
| May 28 | a.d. V Kal. Iun |
| May 29 | a.d. IV Kal. Iun |
| May 30 | a.d. III Kal. Iun |
| May 31 | prid. Kal. Iun |
| Jun 1 | Kal. Iun |
| Jun 2 | a.d. IV Non. Iun |
| Jun 3 | a.d. III Non. Iun |
| Jun 4 | prid. Non. Iun |
| Jun 5 | Non. Iun |
| Jun 6 | a.d. VIII Id. Iun |
| Jun 7 | a.d. VII Id. Iun |
| Jun 8 | a.d. VI Id. Iun |
| Jun 9 | a.d. V Id. Iun |
| Jun 10 | a.d. IV Id. Iun |
| Jun 11 | a.d. III Id. Iun |
| Jun 12 | prid. Id. Iun |
| Jun 13 | Id. Iun |
| Jun 14 | a.d. XVIII Kal. Iul. |
| Jun 15 | a.d. XVII Kal. Iul. |
| Jun 16 | a.d. XVI Kal. Iul. |
| Jun 17 | a.d. XV Kal. Iul. |
| Jun 18 | a.d. XIV Kal. Iul. |
| Jun 19 | a.d. XIII Kal. Iul. |
| Jun 20 | a.d. XII Kal. Iul. |
| Jun 21 | a.d. XI Kal. Iul. |
| Jun 22 | a.d. X Kal. Iul. |
| Jun 23 | a.d. IX Kal. Iul. |
| Jun 24 | a.d. VIII Kal. Iul. |
| Jun 25 | a.d. VII Kal. Iul. |
| Jun 26 | a.d. VI Kal. Iul. |
| Jun 27 | a.d. V Kal. Iul. |
| Jun 28 | a.d. IV Kal. Iul. |
| Jun 29 | a.d. III Kal. Iul. |
| Jun 30 | prid. Kal. Iul. |
| Jul 1 | Kal. Iul. |
| Jul 2 | a.d. VI Non. Iul. |
| Jul 3 | a.d. V Non. Iul. |
| Jul 4 | a.d. IV Non. Iul. |
| Jul 5 | a.d. III Non. Iul. |
| Jul 6 | prid. Non. Iul. |
| Jul 7 | Non. Iul. |
| Jul 8 | a.d. VIII Id. Iul. |
| Jul 9 | a.d. VII Id. Iul. |
| Jul 10 | a.d. VI Id. Iul. |
| Jul 11 | a.d. V Id. Iul. |
| Jul 12 | a.d. IV Id. Iul. |
| Jul 13 | a.d. III Id. Iul. |
| Jul 14 | prid. Id. Iul. |
| Jul 15 | Id. Iul. |
| Jul 16 | a.d. XVII Kal. Aug. |
| Jul 17 | a.d. XVI Kal. Aug. |
| Jul 18 | a.d. XV Kal. Aug. |
| Jul 19 | a.d. XIV Kal. Aug. |
| Jul 20 | a.d. XIII Kal. Aug. |
| Jul 21 | a.d. XII Kal. Aug. |
| Jul 22 | a.d. XI Kal. Aug. |
| Jul 23 | a.d. X Kal. Aug. |
| Jul 24 | a.d. IX Kal. Aug. |
| Jul 25 | a.d. VIII Kal. Aug. |
| Jul 26 | a.d. VII Kal. Aug. |
| Jul 27 | a.d. VI Kal. Aug. |
| Jul 28 | a.d. V Kal. Aug. |
| Jul 29 | a.d. IV Kal. Aug. |
| Jul 30 | a.d. III Kal. Aug. |
| Jul 31 | prid. Kal. Aug. |
| Aug 1 | Kal. Aug. |
| Aug 2 | a.d. IV Non. Aug. |
| Aug 3 | a.d. III Non. Aug. |
| Aug 4 | prid. Non. Aug. |
| Aug 5 | Non. Aug. |
| Aug 6 | a.d. VIII Id. Aug. |
| Aug 7 | a.d. VII Id. Aug. |
| Aug 8 | a.d. VI Id. Aug. |
| Aug 9 | a.d. V Id. Aug. |
| Aug 10 | a.d. IV Id. Aug. |
| Aug 11 | a.d. III Id. Aug. |
| Aug 12 | prid. Id. Aug. |
| Aug 13 | Id. Aug. |
| Aug 14 | a.d. XVIII Kal. Sep. |
| Aug 15 | a.d. XVII Kal. Sep. |
| Aug 16 | a.d. XVI Kal. Sep. |
| Aug 17 | a.d. XV Kal. Sep. |
| Aug 18 | a.d. XIV Kal. Sep. |
| Aug 19 | a.d. XIII Kal. Sep. |
| Aug 20 | a.d. XII Kal. Sep. |
| Aug 21 | a.d. XI Kal. Sep. |
| Aug 22 | a.d. X Kal. Sep. |
| Aug 23 | a.d. IX Kal. Sep. |
| Aug 24 | a.d. VIII Kal. Sep. |
| Aug 25 | a.d. VII Kal. Sep. |
| Aug 26 | a.d. VI Kal. Sep. |
| Aug 27 | a.d. V Kal. Sep. |
| Aug 28 | a.d. IV Kal. Sep. |
| Aug 29 | a.d. III Kal. Sep. |
| Aug 30 | prid. Kal. Sep. |
| Sep 1 | Kal. Sep. |
| Sep 2 | a.d. IV Non. Sep. |
| Sep 3 | a.d. III Non. Sep. |
| Sep 4 | prid. Non. Sep. |
| Sep 5 | Non. Sep. |
| Sep 6 | a.d. VIII Id. Sep. |
| Sep 7 | a.d. VII Id. Sep. |
| Sep 8 | a.d. VI Id. Sep. |
| Sep 9 | a.d. V Id. Sep. |
| Sep 10 | a.d. IV Id. Sep. |
| Sep 11 | a.d. III Id. Sep. |
| Sep 12 | prid. Id. Sep. |
| Sep 13 | Id. Sep. |
| Sep 14 | a.d. XVIII Kal. Oct. |
| Sep 15 | a.d. XVII Kal. Oct. |
| Sep 16 | a.d. XVI Kal. Oct. |
| Sep 17 | a.d. XV Kal. Oct. |
| Sep 18 | a.d. XIV Kal. Oct. |
| Sep 19 | a.d. XIII Kal. Oct. |
| Sep 20 | a.d. XII Kal. Oct. |
| Sep 21 | a.d. XI Kal. Oct. |
| Sep 22 | a.d. X Kal. Oct. |
| Sep 23 | a.d. IX Kal. Oct. |
| Sep 24 | a.d. VIII Kal. Oct. |
| Sep 25 | a.d. VII Kal. Oct. |
| Sep 26 | a.d. VI Kal. Oct. |
| Sep 27 | a.d. V Kal. Oct. |
| Sep 28 | a.d. IV Kal. Oct. |
| Sep 29 | a.d. III Kal. Oct. |
| Sep 30 | prid. Kal. Oct. |
| Oct 1 | Kal. Oct. |
| Oct 2 | a.d. VI Non. Oct. |
| Oct 3 | a.d. V Non. Oct. |
| Oct 4 | a.d. IV Non. Oct. |
| Oct 5 | a.d. III Non. Oct. |
| Oct 6 | prid. Non. Oct. |
| Oct 7 | Non. Oct. |
| Oct 8 | a.d. VIII Id. Oct. |
| Oct 9 | a.d. VII Id. Oct. |
| Oct 10 | a.d. VI Id. Oct. |
| Oct 11 | a.d. V Id. Oct. |
| Oct 12 | a.d. IV Id. Oct. |
| Oct 13 | a.d. III Id. Oct. |
| Oct 14 | prid. Id. Oct. |
| Oct 15 | Id. Oct. | Oct 16 | a.d. XVII Kal. Nov. |
| Oct 17 | a.d. XVI Kal. Nov. |
| Oct 18 | a.d. XV Kal. Nov. |
| Oct 19 | a.d. XIV Kal. Nov. |
| Oct 20 | a.d. XIII Kal. Nov. |
| Oct 21 | a.d. XII Kal. Nov. |
| Oct 22 | a.d. XI Kal. Nov. |
| Oct 23 | a.d. X Kal. Nov. |
| Oct 24 | a.d. IX Kal. Nov. |
| Oct 25 | a.d. VIII Kal. Nov. |
| Oct 26 | a.d. VII Kal. Nov. |
| Oct 27 | a.d. VI Kal. Nov. |
| Oct 28 | a.d. V Kal. Nov. |
| Oct 29 | a.d. IV Kal. Nov. |
| Oct 30 | a.d. III Kal. Nov. |
| Oct 31 | prid. Kal. Nov. |
| Nov 1 | Kal. Nov. |
| Nov 2 | a.d. IV Non. Nov. |
| Nov 3 | a.d. III Non. Nov. |
| Nov 4 | prid. Non. Nov. |
| Nov 5 | Non. Nov. |
| Nov 6 | a.d. VIII Id. Nov. |
| Nov 7 | a.d. VII Id. Nov. |
| Nov 8 | a.d. VI Id. Nov. |
| Nov 9 | a.d. V Id. Nov. |
| Nov 10 | a.d. IV Id. Nov. |
| Nov 11 | a.d. III Id. Nov. |
| Nov 12 | prid. Id. Nov. |
| Nov 13 | Id. Nov. |
| Nov 14 | a.d. XVIII Kal. Dec. |
| Nov 15 | a.d. XVII Kal. Dec. |
| Nov 16 | a.d. XVI Kal. Dec. |
| Nov 17 | a.d. XV Kal. Dec. |
| Nov 18 | a.d. XIV Kal. Dec. |
| Nov 19 | a.d. XIII Kal. Dec. |
| Nov 20 | a.d. XII Kal. Dec. |
| Nov 21 | a.d. XI Kal. Dec. |
| Nov 22 | a.d. X Kal. Dec. |
| Nov 23 | a.d. IX Kal. Dec. |
| Nov 24 | a.d. VIII Kal. Dec. |
| Nov 25 | a.d. VII Kal. Dec. |
| Nov 26 | a.d. VI Kal. Dec. |
| Nov 27 | a.d. V Kal. Dec. |
| Nov 28 | a.d. IV Kal. Dec. |
| Nov 29 | a.d. III Kal. Dec. |
| Nov 30 | prid. Kal. Dec. |
| Dec 1 | Kal. Dec. |
| Dec 2 | a.d. IV Non. Dec. |
| Dec 3 | a.d. III Non. Dec. |
| Dec 4 | prid. Non. Dec. |
| Dec 5 | Non. Dec. |
| Dec 6 | a.d. VIII Id. Dec. |
| Dec 7 | a.d. VII Id. Dec. |
| Dec 8 | a.d. VI Id. Dec. |
| Dec 9 | a.d. V Id. Dec. |
| Dec 10 | a.d. IV Id. Dec. |
| Dec 11 | a.d. III Id. Dec. |
| Dec 12 | prid. Id. Dec. |
| Dec 13 | Id. Dec. |
| Dec 14 | a.d. XIX Kal. Ian. |
| Dec 15 | a.d. XVIII Kal. Ian. |
| Dec 16 | a.d. XVII Kal. Ian. |
| Dec 17 | a.d. XVI Kal. Ian. |
| Dec 18 | a.d. XV Kal. Ian. |
| Dec 19 | a.d. XIV Kal. Ian. |
| Dec 20 | a.d. XIII Kal. Ian. |
| Dec 21 | a.d. XII Kal. Ian. |
| Dec 22 | a.d. XI Kal. Ian. |
| Dec 23 | a.d. X Kal. Ian. |
| Dec 24 | a.d. IX Kal. Ian. |
| Dec 25 | a.d. VIII Kal. Ian. |
| Dec 26 | a.d. VII Kal. Ian. |
| Dec 27 | a.d. VI Kal. Ian. |
| Dec 28 | a.d. V Kal. Ian. |
| Dec 29 | a.d. IV Kal. Ian. |
| Dec 30 | a.d. III Kal. Ian. |
| Dec 31 | prid. Kal. Ian. |
| Jan 1 | Kal. Ian. |
| Jan 2 | a. d. IV Non. Ian. |
| Jan 3 | a. d. III Non. Ian. |
| Jan 4 | prid. Non. Ian. |
| Jan 5 | Non. Ian. |
| Jan 6 | a.d. VIII Id. Ian. |
| Jan 7 | a.d. VII Id. Ian. |
| Jan 8 | a.d. VI Id. Ian. |
| Jan 9 | a.d. V Id. Ian. |
| Jan 10 | a.d. IV Id. Ian. |
| Jan 11 | a.d. III Id. Ian. |
| Jan 12 | prid. Id. Ian. |
| Jan 13 | Id. Ian. |
| Jan 14 | a.d. XIX Kal. Feb. |
| Jan 15 | a.d. XVIII Kal. Feb. |
| Jan 16 | a.d. XVII Kal. Feb. |
| Jan 17 | a.d. XVI Kal. Feb. |
| Jan 18 | a.d. XV Kal. Feb. |
| Jan 19 | a.d. XIV Kal. Feb. |
| Jan 20 | a.d. XIII Kal. Feb. |
| Jan 21 | a.d. XII Kal. Feb. |
| Jan 22 | a.d. XI Kal. Feb. |
| Jan 23 | a.d. X Kal. Feb. |
| Jan 24 | a.d. IX Kal. Feb. |
| Jan 25 | a.d. VIII Kal. Feb. |
| Jan 26 | a.d. VII Kal. Feb. |
| Jan 27 | a.d. VI Kal. Feb. |
| Jan 28 | a.d. V Kal. Feb. |
| Jan 29 | a.d. IV Kal. Feb. |
| Jan 30 | a.d. III Kal. Feb. |
| Jan 31 | prid. Kal. Feb. |
| Feb 1 | Kal. Feb. |
| Feb 2 | a.d. IV Non. Feb |
| Feb 3 | a.d. III Non. Feb |
| Feb 4 | prid. Non. Feb |
| Feb 5 | Non. Feb |
| Feb 6 | a.d. VIII Id. Feb |
| Feb 7 | a.d. VII Id. Feb |
| Feb 8 | a.d. VI Id. Feb |
| Feb 9 | a.d. V Id. Feb |
| Feb 10 | a.d. IV Id. Feb |
| Feb 11 | a.d. III Id. Feb |
| Feb 12 | prid. Id. Feb |
| Feb 13 | Id. Feb |
for days between the ides of february and the kalends of march, the old and new style disagreee about which day is the new one, i.e., in the new style, february 29th is considered to be the leap day, where as in the old style, the seventeenth day before the kalends of march is the lead day
in common years
| Modern | Roman |
|---|---|
| Feb 14 | a.d. XVI Kal. Mart. |
| Feb 15 | a.d. XV Kal. Mart. |
| Feb 16 | a.d. XIV Kal. Mart. |
| Feb 17 | a.d. XIII Kal. Mart. |
| Feb 18 | a.d. XII Kal. Mart. |
| Feb 19 | a.d. XI Kal. Mart. |
| Feb 20 | a.d. X Kal. Mart. |
| Feb 21 | a.d. IX Kal. Mart. |
| Feb 22 | a.d. VIII Kal. Mart. |
| Feb 23 | a.d. VII Kal. Mart. |
| Feb 24 | a.d. VI Kal. Mart. |
| Feb 25 | a.d. V Kal. Mart. |
| Feb 26 | a.d. IV Kal. Mart. |
| Feb 27 | a.d. III Kal. Mart. |
| Feb 28 | prid. Kal. Mart. |
in leap years
| Modern | Roman |
|---|---|
| Feb 14 | a.d. XVII Kal. Mart. |
| Feb 15 | a.d. XVI Kal. Mart. |
| Feb 16 | a.d. XV Kal. Mart. |
| Feb 17 | a.d. XIV Kal. Mart. |
| Feb 18 | a.d. XIII Kal. Mart. |
| Feb 19 | a.d. XII Kal. Mart. |
| Feb 20 | a.d. XI Kal. Mart. |
| Feb 21 | a.d. X Kal. Mart. |
| Feb 22 | a.d. IX Kal. Mart. |
| Feb 23 | a.d. VIII Kal. Mart. |
| Feb 24 | a.d. VII Kal. Mart. |
| Feb 25 | a.d. VI Kal. Mart. |
| Feb 26 | a.d. V Kal. Mart. |
| Feb 27 | a.d. IV Kal. Mart. |
| Feb 28 | a.d. III Kal. Mart. |
| Feb 29 | prid. Kal. Mart. |
