| Millennium: | 4th Millennium BC |
|---|---|
| Centuries: | 36th cent. BC – 35th cent. BC – 34th cent. BC |
| Decades: | 3450s BC 3440s BC 3430s BC – 3420s BC – 3410s BC 3400s BC 3390s BC |
| Years: | 3426 BC 3425 BC 3424 BC – 3423 BC – 3422 BC 3421 BC 3420 BC |
| Gregorian calendar | 3423 MMMCDXXIII |
| Ab urbe condita | 4176 |
| Armenian calendar | 2872 ԹՎ ՍՊՀԲ |
| Assyrian calendar | 8173 |
| Bahá'í calendar | 1579–1580 |
| Bengali calendar | 2830 |
| Berber calendar | 4373 |
| British Regnal year | N/A |
| Buddhist calendar | 3967 |
| Burmese calendar | 2785 |
| Byzantine calendar | 8931–8932 |
| Chinese calendar | 壬戌年 (Water Dog) 6119 or 6059 — to — 癸亥年 (Water Pig) 6120 or 6060 |
| Coptic calendar | 3139–3140 |
| Discordian calendar | 4589 |
| Ethiopian calendar | 3415–3416 |
| Hebrew calendar | 7183–7184 |
| Hindu calendars | |
| - Vikram Samvat | 3479–3480 |
| - Shaka Samvat | 3344–3345 |
| - Kali Yuga | 6523–6524 |
| Holocene calendar | 13423 |
| Igbo calendar | 2423–2424 |
| Iranian calendar | 2801–2802 |
| Islamic calendar | 2887–2888 |
| Japanese calendar | Heisei 1435 (平成１４３５年) |
| Javanese calendar | 3399–3400 |
| Juche calendar | 1512 |
| Julian calendar | Gregorian minus 24 days |
| Korean calendar | 5756 |
| Minguo calendar | ROC 1512 民國1512年 |
| Nanakshahi calendar | 1955 |
| Thai solar calendar | 3966 |
| Unix time | 45852220800–45883756799 |
The year 3423 BC