684

Millennium:	1st millennium
Centuries:	6th century 7th century 8th century
Decades:	660s 670s 680s 690s 700s
Years:	681 682 683 684 685 686 687

684 in various calendars
Gregorian calendar	684 DCLXXXIV
Ab urbe condita	1437
Armenian calendar	133 ԹՎ ՃԼԳ
Assyrian calendar	5434
Balinese saka calendar	605–606
Bengali calendar	91
Berber calendar	1634
Buddhist calendar	1228
Burmese calendar	46
Byzantine calendar	6192–6193
Chinese calendar	癸未年 (Water Goat) 3380 or 3320 — to — 甲申年 (Wood Monkey) 3381 or 3321
Coptic calendar	400–401
Discordian calendar	1850
Ethiopian calendar	676–677
Hebrew calendar	4444–4445
Hindu calendars
- Vikram Samvat	740–741
- Shaka Samvat	605–606
- Kali Yuga	3784–3785
Holocene calendar	10684
Iranian calendar	62–63
Islamic calendar	64–65
Japanese calendar	N/A
Javanese calendar	576–577
Julian calendar	684 DCLXXXIV
Korean calendar	3017
Minguo calendar	1228 before ROC 民前1228年
Nanakshahi calendar	−784
Seleucid era	995/996 AG
Thai solar calendar	1226–1227
Tibetan calendar	阴水羊年 (female Water-Goat) 810 or 429 or −343 — to — 阳木猴年 (male Wood-Monkey) 811 or 430 or −342
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Year 684 (DCLXXXIV) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 684 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.