| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 210s 220s 230s – 240s – 250s 260s 270s |
| Years: | 239 240 241 – 242 – 243 244 245 |
| 242 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 242 CCXLII |
| Ab urbe condita | 995 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1602 – -1601 |
| Bengali calendar | -351 |
| Berber calendar | 1192 |
| Buddhist calendar | 786 |
| Burmese calendar | -396 |
| Byzantine calendar | 5750 – 5751 |
| Chinese calendar | 辛酉年十一月十三日 (2878/2938-11-13) — to —
壬戌年十一月廿二日(2879/2939-11-22) |
| Coptic calendar | -42 – -41 |
| Ethiopian calendar | 234 – 235 |
| Hebrew calendar | 4002 – 4003 |
| Hindu calendars | |
| - Bikram Samwat | 298 – 299 |
| - Shaka Samvat | 164 – 165 |
| - Kali Yuga | 3343 – 3344 |
| Holocene calendar | 10242 |
| Iranian calendar | 380 BP – 379 BP |
| Islamic calendar | 392 BH – 391 BH |
| Japanese calendar | |
| Korean calendar | 2575 |
| Thai solar calendar | 785 |