Roman Arabic I, i or j 1 II or ii 2 III or iii 3 IV or iv 4 V or v 5 VI or vi 6 VII or vii 7 VIII or viii 8 IX or ix 9 X or x 10 XI or xi 11 XII or xii etc. 12 XX or xx 20 XXX or xxx 30 XL or xl also XXXX 40 L or l 50 LX or lx 60 LXX or lxx 70 LXXX or lxxx, also XXC 80 XC or xc also LXXXX 90 C or c 100 CL or cl 150 CC or cc 200 CCC or ccc 300 CD or cd, also CCCC 400 D or d, also I) 500 DC or dc, also IC 600 CM or cm 900 M or m also CI) 1,000
Hebrew dates found in imprints may be converted to the Christian date by consulting the Jewish encyclopedia under Calendar, Table 1. Islamic dates may be converted by consulting the tables found in John J. Bond's Handy Book of rules and tables for verifying dates with the Christian era, 4th ed. London, 1889, pp. 228-250. The French Revolution calendar is given below:
1 Sept. 22 1792 -1 2 Sept. 22 1793 -2 3 Sept. 22 1794 -3 4 Sept. 23 1795 -4 5 Sept. 22 1796 -5 6 Sept. 22 1797 -6 7 Sept. 22 1798 -7 8 Sept. 23 1799 -8 9 Sept. 23 1800 -9 10 Sept. 23 1801 -10 11 Sept. 23 1802 -11 12 Sept. 24 1803 -12 13 Sept. 23 1804 -13 14 Sept. 23 1805 -14 Dec. 31 1805 end
Months (12 of 30 days each, with five additional days)
Vendémaiaire (vintage) Brumaire (fog) Frimaire (sleet) Nivôse (snow) Pluvôise (rain) Venlôse (wind) Germinal (seed) Floréal (blossom) Prairial (pasture) Thermidor or Fervidor (heat) Fructidor (fruit)