646

Millennium: 1st millennium
Centuries:
Decades:
Years:
646 in various calendars
Gregorian calendar646
DCXLVI
Ab urbe condita1399
Armenian calendar95
ԹՎ ՂԵ
Assyrian calendar5396
Balinese saka calendar567–568
Bengali calendar53
Berber calendar1596
Buddhist calendar1190
Burmese calendar8
Byzantine calendar6154–6155
Chinese calendar乙巳年 (Wood Snake)
3343 or 3136
    — to —
丙午年 (Fire Horse)
3344 or 3137
Coptic calendar362–363
Discordian calendar1812
Ethiopian calendar638–639
Hebrew calendar4406–4407
Hindu calendars
 - Vikram Samvat702–703
 - Shaka Samvat567–568
 - Kali Yuga3746–3747
Holocene calendar10646
Iranian calendar24–25
Islamic calendar25–26
Japanese calendarTaika 2
(大化2年)
Javanese calendar537–538
Julian calendar646
DCXLVI
Korean calendar2979
Minguo calendar1266 before ROC
民前1266年
Nanakshahi calendar−822
Seleucid era957/958 AG
Thai solar calendar1188–1189
Tibetan calendar阴木蛇年
(female Wood-Snake)
772 or 391 or −381
    — to —
阳火马年
(male Fire-Horse)
773 or 392 or −380
Uthman ibn Affan founds the city of Jeddah

Year 646 (DCXLVI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 646 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.