| Millennium: | 4th Millennium BC |
|---|---|
| Centuries: | 37th cent. BC – 36th cent. BC – 35th cent. BC |
| Decades: | 3540s BC 3530s BC 3520s BC – 3510s BC – 3500s BC 3490s BC 3480s BC |
| Years: | 3521 BC 3520 BC 3519 BC – 3518 BC – 3517 BC 3516 BC 3515 BC |
| Gregorian calendar | 3518 MMMDXVIII |
| Ab urbe condita | 4271 |
| Armenian calendar | 2967 ԹՎ ՍՋԿԷ |
| Assyrian calendar | 8268 |
| Bahá'í calendar | 1674–1675 |
| Bengali calendar | 2925 |
| Berber calendar | 4468 |
| British Regnal year | N/A |
| Buddhist calendar | 4062 |
| Burmese calendar | 2880 |
| Byzantine calendar | 9026–9027 |
| Chinese calendar | 丁酉年 (Fire Rooster) 6214 or 6154 — to — 戊戌年 (Earth Dog) 6215 or 6155 |
| Coptic calendar | 3234–3235 |
| Discordian calendar | 4684 |
| Ethiopian calendar | 3510–3511 |
| Hebrew calendar | 7278–7279 |
| Hindu calendars | |
| - Vikram Samvat | 3574–3575 |
| - Shaka Samvat | 3439–3440 |
| - Kali Yuga | 6618–6619 |
| Holocene calendar | 13518 |
| Igbo calendar | 2518–2519 |
| Iranian calendar | 2896–2897 |
| Islamic calendar | 2985–2986 |
| Japanese calendar | Heisei 1530 (平成１５３０年) |
| Javanese calendar | 3497–3498 |
| Juche calendar | 1607 |
| Julian calendar | Gregorian minus 25 days |
| Korean calendar | 5851 |
| Minguo calendar | ROC 1607 民國1607年 |
| Nanakshahi calendar | 2050 |
| Thai solar calendar | 4061 |
| Unix time | 48850128000–48881663999 |
The year 3518 BC