639

Millennium:	1st millennium
Centuries:	6th century 7th century 8th century
Decades:	610s 620s 630s 640s 650s
Years:	636 637 638 639 640 641 642

639 in various calendars
Gregorian calendar	639 DCXXXIX
Ab urbe condita	1392
Armenian calendar	88 ԹՎ ՁԸ
Assyrian calendar	5389
Bengali calendar	46
Berber calendar	1589
Buddhist calendar	1183
Burmese calendar	1
Byzantine calendar	6147–6148
Chinese calendar	戊戌年 (Earth Dog) 3335 or 3275 — to — 己亥年 (Earth Pig) 3336 or 3276
Coptic calendar	355–356
Discordian calendar	1805
Ethiopian calendar	631–632
Hebrew calendar	4399–4400
Hindu calendars
- Vikram Samvat	695–696
- Shaka Samvat	560–561
- Kali Yuga	3739–3740
Holocene calendar	10639
Iranian calendar	17–18
Islamic calendar	17–19
Japanese calendar	N/A
Javanese calendar	529–530
Julian calendar	639 DCXXXIX
Korean calendar	2972
Minguo calendar	1273 before ROC 民前1273年
Nanakshahi calendar	−829
Seleucid era	950/951 AG
Thai solar calendar	1181–1182
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Year 639 (DCXXXIX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 639 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.