638 BC

Millennium:	1st millennium BC
Centuries:	8th century BC 7th century BC 6th century BC
Decades:	650s BC 640s BC 630s BC 620s BC 610s BC
Years:	641 BC 640 BC 639 BC 638 BC 637 BC 636 BC 635 BC

638 BC in various calendars
Gregorian calendar	638 BC DCXXXVII BC
Ab urbe condita	116
Ancient Egypt era	XXVI dynasty, 27
- Pharaoh	Psamtik I, 27
Ancient Greek era	35th Olympiad, year 3
Assyrian calendar	4113
Balinese saka calendar	N/A
Bengali calendar	−1230
Berber calendar	313
Buddhist calendar	−93
Burmese calendar	−1275
Byzantine calendar	4871–4872
Chinese calendar	壬午年 (Water Horse) 2059 or 1999 — to — 癸未年 (Water Goat) 2060 or 2000
Coptic calendar	−921 – −920
Discordian calendar	529
Ethiopian calendar	−645 – −644
Hebrew calendar	3123–3124
Hindu calendars
- Vikram Samvat	−581 – −580
- Shaka Samvat	N/A
- Kali Yuga	2463–2464
Holocene calendar	9363
Iranian calendar	1259 BP – 1258 BP
Islamic calendar	1298 BH – 1297 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	1696
Minguo calendar	2549 before ROC 民前2549年
Nanakshahi calendar	−2105
Thai solar calendar	−95 – −94
Tibetan calendar	阳水马年 (male Water-Horse) −511 or −892 or −1664 — to — 阴水羊年 (female Water-Goat) −510 or −891 or −1663
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