664
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 664 DCLXIV |
| Ab urbe condita | 1417 |
| Armenian calendar | 113 ԹՎ ՃԺԳ |
| Assyrian calendar | 5414 |
| Bengali calendar | 71 |
| Berber calendar | 1614 |
| Buddhist calendar | 1208 |
| Burmese calendar | 26 |
| Byzantine calendar | 6172–6173 |
| Chinese calendar |
癸亥年 (Water Pig) 3360 or 3300 — to — 甲子年 (Wood Rat) 3361 or 3301 |
| Coptic calendar | 380–381 |
| Discordian calendar | 1830 |
| Ethiopian calendar | 656–657 |
| Hebrew calendar | 4424–4425 |
| Hindu calendars | |
| - Vikram Samvat | 720–721 |
| - Shaka Samvat | 585–586 |
| - Kali Yuga | 3764–3765 |
| Holocene calendar | 10664 |
| Iranian calendar | 42–43 |
| Islamic calendar | 43–44 |
| Japanese calendar | N/A |
| Javanese calendar | 555–556 |
| Julian calendar | 664 DCLXIV |
| Korean calendar | 2997 |
| Minguo calendar | 1248 before ROC 民前1248年 |
| Nanakshahi calendar | −804 |
| Seleucid era | 975/976 AG |
| Thai solar calendar | 1206–1207 |
Year 664 (DCLXIV) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 664 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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