BC:4000

Millennium:	5th Millennium BC
Centuries:	42nd cent. BC – 41st cent. BC – 40th cent. BC
Decades:	4010s BC – 4000s BC 3990s BC 3980s BC 3970s BC 3960s BC 3950s BC
Years:	4003 BC 4002 BC 4001 BC – 4000 BC – 3999 BC 3998 BC 3997 BC

4000 BC in other calendars

Gregorian calendar	4000 BC MMMCMXCIX BC
Assyrian calendar	751
Bengali calendar	−4592
Berber calendar	−3049
Buddhist calendar	−3455
Burmese calendar	−4637
Byzantine calendar	1509–1510
Chinese calendar	庚辰年 (Metal Dragon) −1303 or −1363     — to — 辛巳年 (Metal Snake) −1302 or −1362
Coptic calendar	−4283 – −4282
Discordian calendar	−2833
Ethiopian calendar	−4007 – −4006
Hebrew calendar	−239 – −238
Hindu calendars
- Vikram Samvat	−3943 – −3942
- Shaka Samvat	N/A
- Kali Yuga	−899 – −898
Holocene calendar	6001
Iranian calendar	4621 BP – 4620 BP
Islamic calendar	4763 BH – 4762 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	−1666
Minguo calendar	5911 before ROC 民前5911年
Nanakshahi calendar	−5467
Thai solar calendar	−3457 – −3456

The year 4000 BC is 4 years from the estimated date of the creation of the world. Either Adam and Eve were still enjoying the Garden of Eden at this time, or they were already expelled from it. The Bible doesn't clearly say when they were expelled from the Garden.