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Year 664 (DCLXIV) was a leap year starting on Monday 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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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 664 | - Kali Yuga | 3764–3765 | 1.00 | infobox |
| 664 | - Shaka Samvat | 585–586 | 1.00 | infobox |
| 664 | - Vikram Samvat | 720–721 | 1.00 | infobox |
| 664 | Ab urbe condita | 1417 | 1.00 | infobox |
| 664 | Armenian calendar | 113 ԹՎ ՃԺԳ | 1.00 | infobox |
| 664 | Assyrian calendar | 5414 | 1.00 | infobox |
| 664 | Balinese saka calendar | 585–586 | 1.00 | infobox |
| 664 | Bengali calendar | 70–71 | 1.00 | infobox |
| 664 | Berber calendar | 1614 | 1.00 | infobox |
| 664 | Buddhist calendar | 1208 | 1.00 | infobox |
| 664 | Burmese calendar | 26 | 1.00 | infobox |
| 664 | Byzantine calendar | 6172–6173 | 1.00 | infobox |
| 664 | Chinese calendar | 癸亥年 (Water Pig) 3361 or 3154 — to — 甲子年 (Wood Rat) 3362 or 3155 | 1.00 | infobox |
| 664 | Coptic calendar | 380–381 | 1.00 | infobox |
| 664 | Discordian calendar | 1830 | 1.00 | infobox |
| 664 | Ethiopian calendar | 656–657 | 1.00 | infobox |
| 664 | Gregorian calendar | 664 DCLXIV | 1.00 | infobox |
| 664 | Hebrew calendar | 4424–4425 | 1.00 | infobox |
| 664 | Holocene calendar | 10664 | 1.00 | infobox |
| 664 | Iranian calendar | 42–43 | 1.00 | infobox |
| 664 | Islamic calendar | 43–44 | 1.00 | infobox |
| 664 | Japanese calendar | Hakuchi 15 (白雉１５年) | 1.00 | infobox |
| 664 | Javanese calendar | 555–556 | 1.00 | infobox |
| 664 | Julian calendar | 664 DCLXIV | 1.00 | infobox |
| 664 | Korean calendar | 2997 | 1.00 | infobox |
| 664 | Minguo calendar | 1248 before ROC 民前1248年 | 1.00 | infobox |
| 664 | Nanakshahi calendar | −804 | 1.00 | infobox |
| 664 | Seleucid era | 975/976 AG | 1.00 | infobox |
| 664 | Thai solar calendar | 1206–1207 | 1.00 | infobox |
| 664 | Tibetan calendar | ཆུ་མོ་ཕག་ལོ་ (female Water-Boar) 790 or 409 or −363 — to — ཤིང་ཕོ་བྱི་བ་ལོ་ (male Wood-Rat) 791 or 410 or −362 | 1.00 | infobox |
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