642 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:	645 BC 644 BC 643 BC 642 BC 641 BC 640 BC 639 BC

642 BC in various calendars
Gregorian calendar	642 BC DCXLI BC
Ab urbe condita	112
Ancient Egypt era	XXVI dynasty, 23
- Pharaoh	Psamtik I, 23
Ancient Greek era	34th Olympiad, year 3
Assyrian calendar	4109
Bengali calendar	−1234
Berber calendar	309
Buddhist calendar	−97
Burmese calendar	−1279
Byzantine calendar	4867–4868
Chinese calendar	戊寅年 (Earth Tiger) 2055 or 1995 — to — 己卯年 (Earth Rabbit) 2056 or 1996
Coptic calendar	−925 – −924
Discordian calendar	525
Ethiopian calendar	−649 – −648
Hebrew calendar	3119–3120
Hindu calendars
- Vikram Samvat	−585 – −584
- Shaka Samvat	N/A
- Kali Yuga	2459–2460
Holocene calendar	9359
Iranian calendar	1263 BP – 1262 BP
Islamic calendar	1302 BH – 1301 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	1692
Minguo calendar	2553 before ROC 民前2553年
Nanakshahi calendar	−2109
Thai solar calendar	−99 – −98
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