| Millennium: | 3rd millennium |
|---|---|
| Centuries: | 20th century – 21st century – 22nd century |
| Decades: | 2010s 2020s 2030s – 2040s – 2050s 2060s 2070s |
| Years: | 2037 2038 2039 – 2040 – 2041 2042 2043 |
| Gregorian calendar | 2040 MMXL |
| Ab urbe condita | 2793 |
| Armenian calendar | 1489 ԹՎ ՌՆՁԹ |
| Bahá'í calendar | 196 – 197 |
| Bengali calendar | 1447 |
| Berber calendar | 2990 |
| Buddhist calendar | 2584 |
| Burmese calendar | 1402 |
| Byzantine calendar | 7548 – 7549 |
| Chinese calendar | 己未年十一月十七日 (4676/4736-11-17) — to —
庚申年十一月廿八日(4677/4737-11-28) |
| Coptic calendar | 1756 – 1757 |
| Ethiopian calendar | 2032 – 2033 |
| Hebrew calendar | 5800 – 5801 |
| Hindu calendars | |
| - Bikram Samwat | 2096 – 2097 |
| - Shaka Samvat | 1962 – 1963 |
| - Kali Yuga | 5141 – 5142 |
| Holocene calendar | 12040 |
| Iranian calendar | 1418 – 1419 |
| Islamic calendar | 1461 – 1462 |
| Japanese calendar | Heisei 52 (平成52年) |
| Korean calendar | 4373 |
| Thai solar calendar | 2583 |
| Unix time | 2208988800 – 2240611199 |
2040 (MMXL) will be a leap year starting on Sunday of the Gregorian calendar.
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