640
635- 636- 637- 638- 639 - 640 -641 -642- 643 -644- 645
640, goreyê reqemanê romenan ra nuştışê cı DCXL aseno.
| Gregoryen | 640 | |
| Ab Urbe | 1393 | |
| Teqwimê Ermeniyan | 89 ԹՎ ՁԹ | |
| Asuri | 5390 | |
| Teqwimê Bahai | -1204–-1203 | |
| Teqwimo Bengalki | 47 | |
| Teqwimê Berberan | 1590 | |
| [[Dewrname|]] | N/A | |
| Teqwimê Budistan | 1184 | |
| Teqwimê Myanmari | 2 | |
| Teqwimê Bizansi | 6148–6149 | |
| Teqwimo İbranki | 4400–4401 | |
| İran | 18–19 | |
| Teqwimo Hıcri | 19–20 | |
| Teqwimê Japonan | ||
| Teqwimê Korya | 2973 | |
| Teqwimê Minguo | 1272 before Çin 民前1272年 | |
| Thai solar | 1183 | |
