644 BC

Millennium:	1st millennium BC
Centuries:	8th century BC 7th century BC 6th century BC
Decades:	660s BC 650s BC 640s BC 630s BC 620s BC
Years:	647 BC 646 BC 645 BC 644 BC 643 BC 642 BC 641 BC

644 BC in various calendars
Gregorian calendar	644 BC DCXLIII BC
Ab urbe condita	110
Ancient Egypt era	XXVI dynasty, 21
- Pharaoh	Psamtik I, 21
Ancient Greek era	34th Olympiad (victor )¹
Assyrian calendar	4107
Balinese saka calendar	N/A
Bengali calendar	−1236
Berber calendar	307
Buddhist calendar	−99
Burmese calendar	−1281
Byzantine calendar	4865–4866
Chinese calendar	丙子年 (Fire Rat) 2053 or 1993 — to — 丁丑年 (Fire Ox) 2054 or 1994
Coptic calendar	−927 – −926
Discordian calendar	523
Ethiopian calendar	−651 – −650
Hebrew calendar	3117–3118
Hindu calendars
- Vikram Samvat	−587 – −586
- Shaka Samvat	N/A
- Kali Yuga	2457–2458
Holocene calendar	9357
Iranian calendar	1265 BP – 1264 BP
Islamic calendar	1304 BH – 1303 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	1690
Minguo calendar	2555 before ROC 民前2555年
Nanakshahi calendar	−2111
Thai solar calendar	−101 – −100
Tibetan calendar	阳火鼠年 (male Fire-Rat) −517 or −898 or −1670 — to — 阴火牛年 (female Fire-Ox) −516 or −897 or −1669
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