| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 678 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 678 DCLXXVIII |
| Ab urbe condita | 1431 |
| Armenian calendar | 127 ԹՎ ՃԻԷ |
| Assyrian calendar | 5428 |
| Balinese saka calendar | 599–600 |
| Bengali calendar | 85 |
| Berber calendar | 1628 |
| Buddhist calendar | 1222 |
| Burmese calendar | 40 |
| Byzantine calendar | 6186–6187 |
| Chinese calendar | 丁丑年 (Fire Ox) 3375 or 3168 — to — 戊寅年 (Earth Tiger) 3376 or 3169 |
| Coptic calendar | 394–395 |
| Discordian calendar | 1844 |
| Ethiopian calendar | 670–671 |
| Hebrew calendar | 4438–4439 |
| Hindu calendars | |
| - Vikram Samvat | 734–735 |
| - Shaka Samvat | 599–600 |
| - Kali Yuga | 3778–3779 |
| Holocene calendar | 10678 |
| Iranian calendar | 56–57 |
| Islamic calendar | 58–59 |
| Japanese calendar | Hakuchi 29 (白雉２９年) |
| Javanese calendar | 570–571 |
| Julian calendar | 678 DCLXXVIII |
| Korean calendar | 3011 |
| Minguo calendar | 1234 before ROC 民前1234年 |
| Nanakshahi calendar | −790 |
| Seleucid era | 989/990 AG |
| Thai solar calendar | 1220–1221 |
| Tibetan calendar | 阴火牛年 (female Fire-Ox) 804 or 423 or −349 — to — 阳土虎年 (male Earth-Tiger) 805 or 424 or −348 |
Year 678 (DCLXXVIII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 678 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.