420
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 420 CDXX |
| Ab urbe condita | 1173 |
| Assyrian calendar | 5170 |
| Bengali calendar | −173 |
| Berber calendar | 1370 |
| Buddhist calendar | 964 |
| Burmese calendar | −218 |
| Byzantine calendar | 5928–5929 |
| Chinese calendar |
己未年 (Earth Goat) 3116 or 3056 — to — 庚申年 (Metal Monkey) 3117 or 3057 |
| Coptic calendar | 136–137 |
| Discordian calendar | 1586 |
| Ethiopian calendar | 412–413 |
| Hebrew calendar | 4180–4181 |
| Hindu calendars | |
| - Vikram Samvat | 476–477 |
| - Shaka Samvat | 341–342 |
| - Kali Yuga | 3520–3521 |
| Holocene calendar | 10420 |
| Iranian calendar | 202 BP – 201 BP |
| Islamic calendar | 208 BH – 207 BH |
| Javanese calendar | 304–305 |
| Julian calendar | 420 CDXX |
| Korean calendar | 2753 |
| Minguo calendar | 1492 before ROC 民前1492年 |
| Nanakshahi calendar | −1048 |
| Seleucid era | 731/732 AG |
| Thai solar calendar | 962–963 |
Year 420 (CDXX) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Theodosius and Constantius (or, less frequently, year 1173 Ab urbe condita). The denomination 420 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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