| Millennium: | 1st millennium |
|---|---|
| Centuries: | 6th century – 7th century – 8th century |
| Decades: | 610s 620s 630s – 640s – 650s 660s 670s |
| Years: | 642 643 644 – 645 – 646 647 648 |
| 645 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 645 DCXLV |
| Ab urbe condita | 1398 |
| Armenian calendar | 94 ԹՎ ՂԴ |
| Assyrian calendar | 5395 |
| Bahá'í calendar | -1199–-1198 |
| Bengali calendar | 52 |
| Berber calendar | 1595 |
| English Regnal year | N/A |
| Buddhist calendar | 1189 |
| Burmese calendar | 7 |
| Byzantine calendar | 6153–6154 |
| Chinese calendar | 甲辰年十一月廿八日 (3281/3341-11-28) — to —
乙巳年十二月初八日(3282/3342-12-8) |
| Coptic calendar | 361–362 |
| Ethiopian calendar | 637–638 |
| Hebrew calendar | 4405–4406 |
| Hindu calendars | |
| - Vikram Samvat | 701–702 |
| - Shaka Samvat | 567–568 |
| - Kali Yuga | 3746–3747 |
| Holocene calendar | 10645 |
| Iranian calendar | 23–24 |
| Islamic calendar | 24–25 |
| Japanese calendar | |
| Korean calendar | 2978 |
| Minguo calendar | 1267 before ROC 民前1267年 |
| Thai solar calendar | 1188 |
| Wikimedia Commons has media related to: 645 |
Year 645 (DCXLV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 645 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
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