AD 20
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | AD 20 XX |
| Ab urbe condita | 773 |
| Assyrian calendar | 4770 |
| Bengali calendar | −573 |
| Berber calendar | 970 |
| Buddhist calendar | 564 |
| Burmese calendar | −618 |
| Byzantine calendar | 5528–5529 |
| Chinese calendar |
己卯年 (Earth Rabbit) 2716 or 2656 — to — 庚辰年 (Metal Dragon) 2717 or 2657 |
| Coptic calendar | −264 – −263 |
| Discordian calendar | 1186 |
| Ethiopian calendar | 12–13 |
| Hebrew calendar | 3780–3781 |
| Hindu calendars | |
| - Vikram Samvat | 76–77 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3120–3121 |
| Holocene calendar | 10020 |
| Iranian calendar | 602 BP – 601 BP |
| Islamic calendar | 621 BH – 619 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 20 XX |
| Korean calendar | 2353 |
| Minguo calendar | 1892 before ROC 民前1892年 |
| Nanakshahi calendar | −1448 |
| Seleucid era | 331/332 AG |
| Thai solar calendar | 562–563 |
AD 20 (XX) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Marcus Valerius Messalla Barbatus and Cotta (or, less frequently, year 773 Ab urbe condita). The denomination 20 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
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