| Millennium: | 3rd Millennium BC |
|---|---|
| Centuries: | 27th cent. BC – 26th cent. BC – 25th cent. BC |
| Decades: | 2570s BC 2560s BC 2550s BC – 2540s BC – 2530s BC 2520s BC 2510s BC |
| Years: | 2545 BC 2544 BC 2543 BC – 2542 BC – 2541 BC 2540 BC 2539 BC |
| Gregorian calendar | 2542 MMDXLII |
| Ab urbe condita | 3295 |
| Armenian calendar | 1991 ԹՎ ՌՋՂԱ |
| Assyrian calendar | 7292 |
| Bahá'í calendar | 698–699 |
| Bengali calendar | 1949 |
| Berber calendar | 3492 |
| British Regnal year | N/A |
| Buddhist calendar | 3086 |
| Burmese calendar | 1904 |
| Byzantine calendar | 8050–8051 |
| Chinese calendar | 辛巳年 (Metal Snake) 5238 or 5178 — to — 壬午年 (Water Horse) 5239 or 5179 |
| Coptic calendar | 2258–2259 |
| Discordian calendar | 3708 |
| Ethiopian calendar | 2534–2535 |
| Hebrew calendar | 6302–6303 |
| Hindu calendars | |
| - Vikram Samvat | 2598–2599 |
| - Shaka Samvat | 2463–2464 |
| - Kali Yuga | 5642–5643 |
| Holocene calendar | 12542 |
| Igbo calendar | 1542–1543 |
| Iranian calendar | 1920–1921 |
| Islamic calendar | 1979–1980 |
| Japanese calendar | Heisei 554 (平成５５４年) |
| Javanese calendar | 2491–2492 |
| Juche calendar | 631 |
| Julian calendar | Gregorian minus 17 days |
| Korean calendar | 4875 |
| Minguo calendar | ROC 631 民國631年 |
| Nanakshahi calendar | 1074 |
| Thai solar calendar | 3085 |
| Unix time | 18050601600–18082137599 |
The year 2542 BC