645
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 645 DCXLV |
| Ab urbe condita | 1398 |
| Armenian calendar | 94 ԹՎ ՂԴ |
| Assyrian calendar | 5395 |
| Bengali calendar | 52 |
| Berber calendar | 1595 |
| Buddhist calendar | 1189 |
| Burmese calendar | 7 |
| Byzantine calendar | 6153–6154 |
| Chinese calendar |
甲辰年 (Wood Dragon) 3341 or 3281 — to — 乙巳年 (Wood Snake) 3342 or 3282 |
| Coptic calendar | 361–362 |
| Discordian calendar | 1811 |
| Ethiopian calendar | 637–638 |
| Hebrew calendar | 4405–4406 |
| Hindu calendars | |
| - Vikram Samvat | 701–702 |
| - Shaka Samvat | 566–567 |
| - Kali Yuga | 3745–3746 |
| Holocene calendar | 10645 |
| Iranian calendar | 23–24 |
| Islamic calendar | 24–25 |
| Japanese calendar |
Taika 1 (大化元年) |
| Javanese calendar | 536–537 |
| Julian calendar | 645 DCXLV |
| Korean calendar | 2978 |
| Minguo calendar | 1267 before ROC 民前1267年 |
| Nanakshahi calendar | −823 |
| Seleucid era | 956/957 AG |
| Thai solar calendar | 1187–1188 |
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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