1840
1835- 1836- 1837- 1838- 1839 - 1840 -1841 -1842- 1843 -1844- 1845
1840, goreyê reqemanê romenan ra nuştışê cı MDCCCXL aseno.
| Gregoryen | 1840 | |
| Ab Urbe | 2593 | |
| Teqwimê Ermeniyan | 1289 ԹՎ ՌՄՁԹ | |
| Asuri | 6590 | |
| Teqwimê Bahai | -4–-3 | |
| Teqwimo Bengalki | 1247 | |
| Teqwimê Berberan | 2790 | |
| İngılız | 3 Vict. 1 – 4 Vict. 1 | |
| Teqwimê Budistan | 2384 | |
| Teqwimê Myanmari | 1202 | |
| Teqwimê Bizansi | 7348–7349 | |
| Teqwimo İbranki | 5600–5601 | |
| İran | 1218–1219 | |
| Teqwimo Hıcri | 1255–1256 | |
| Teqwimê Japonan | Tenpō 11 (天保11年) | |
| Teqwimê Korya | 4173 | |
| Teqwimê Minguo | 72 before Çin 民前72年 | |
| Thai solar | 2383 | |