640

Millennium: 1st millennium
Centuries:
Decades:
Years:
640 in various calendars
Gregorian calendar640
DCXL
Ab urbe condita1393
Armenian calendar89
ԹՎ ՁԹ
Assyrian calendar5390
Balinese saka calendar561–562
Bengali calendar47
Berber calendar1590
Buddhist calendar1184
Burmese calendar2
Byzantine calendar6148–6149
Chinese calendar己亥年 (Earth Pig)
3337 or 3130
    — to —
庚子年 (Metal Rat)
3338 or 3131
Coptic calendar356–357
Discordian calendar1806
Ethiopian calendar632–633
Hebrew calendar4400–4401
Hindu calendars
 - Vikram Samvat696–697
 - Shaka Samvat561–562
 - Kali Yuga3740–3741
Holocene calendar10640
Iranian calendar18–19
Islamic calendar19–20
Japanese calendarN/A
Javanese calendar530–531
Julian calendar640
DCXL
Korean calendar2973
Minguo calendar1272 before ROC
民前1272年
Nanakshahi calendar−828
Seleucid era951/952 AG
Thai solar calendar1182–1183
Tibetan calendar阴土猪年
(female Earth-Pig)
766 or 385 or −387
    — to —
阳金鼠年
(male Iron-Rat)
767 or 386 or −386

Year 640 (DCXL) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 640 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.