| Millennium: | 4th Millennium BC |
|---|---|
| Centuries: | 40th cent. BC – 39th cent. BC – 38th cent. BC |
| Decades: | 3870s BC 3860s BC 3850s BC – 3840s BC – 3830s BC 3820s BC 3810s BC |
| Years: | 3845 BC 3844 BC 3843 BC – 3842 BC – 3841 BC 3840 BC 3839 BC |
| Gregorian calendar | 3842 MMMDCCCXLII |
| Ab urbe condita | 4595 |
| Armenian calendar | 3291 ԹՎ ՎՄՂԱ |
| Assyrian calendar | 8592 |
| Bahá'í calendar | 1998–1999 |
| Bengali calendar | 3249 |
| Berber calendar | 4792 |
| British Regnal year | N/A |
| Buddhist calendar | 4386 |
| Burmese calendar | 3204 |
| Byzantine calendar | 9350–9351 |
| Chinese calendar | 辛酉年 (Metal Rooster) 6538 or 6478 — to — 壬戌年 (Water Dog) 6539 or 6479 |
| Coptic calendar | 3558–3559 |
| Discordian calendar | 5008 |
| Ethiopian calendar | 3834–3835 |
| Hebrew calendar | 7602–7603 |
| Hindu calendars | |
| - Vikram Samvat | 3898–3899 |
| - Shaka Samvat | 3763–3764 |
| - Kali Yuga | 6942–6943 |
| Holocene calendar | 13842 |
| Igbo calendar | 2842–2843 |
| Iranian calendar | 3220–3221 |
| Islamic calendar | 3319–3320 |
| Japanese calendar | Heisei 1854 (平成１８５４年) |
| Javanese calendar | 3831–3832 |
| Juche calendar | 1931 |
| Julian calendar | Gregorian minus 27 days |
| Korean calendar | 6175 |
| Minguo calendar | ROC 1931 民國1931年 |
| Nanakshahi calendar | 2374 |
| Thai solar calendar | 4385 |
| Unix time | 59074617600–59106153599 |
The year 3842 BC