| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 600s 610s 620s 630s 640s 650s 660s |
| Years: | 633 634 635 636 637 638 639 |
| 636 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 636 DCXXXVI |
| Ab urbe condita | 1389 |
| Armenian calendar | 85 ԹՎ ՁԵ |
| Bahá'í calendar | -1208 – -1207 |
| Bengali calendar | 43 |
| Berber calendar | 1586 |
| Buddhist calendar | 1180 |
| Burmese calendar | -2 |
| Byzantine calendar | 6144 – 6145 |
| Chinese calendar | 乙未年十一月十八日 (3272/3332-11-18) — to —
丙申年十一月廿九日(3273/3333-11-29) |
| Coptic calendar | 352 – 353 |
| Ethiopian calendar | 628 – 629 |
| Hebrew calendar | 4396 – 4397 |
| Hindu calendars | |
| - Bikram Samwat | 692 – 693 |
| - Shaka Samvat | 558 – 559 |
| - Kali Yuga | 3737 – 3738 |
| Holocene calendar | 10636 |
| Iranian calendar | 14 – 15 |
| Islamic calendar | 14 – 15 |
| Japanese calendar | |
| Korean calendar | 2969 |
| Thai solar calendar | 1179 |