404
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| Millennium |
| 1st millennium |
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| 404 by topic |
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| Arts, history, and science |
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| Countries |
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| Lists of leaders |
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| Gregorian calendar | 404 CDIV |
| Ab urbe condita | 1157 |
| Assyrian calendar | 5154 |
| Balinese saka calendar | 325–326 |
| Bengali calendar | −189 |
| Berber calendar | 1354 |
| Buddhist calendar | 948 |
| Burmese calendar | −234 |
| Byzantine calendar | 5912–5913 |
| Chinese calendar | 癸卯年 (Water Rabbit) 3100 or 3040 — to — 甲辰年 (Wood Dragon) 3101 or 3041 |
| Coptic calendar | 120–121 |
| Discordian calendar | 1570 |
| Ethiopian calendar | 396–397 |
| Hebrew calendar | 4164–4165 |
| Hindu calendars | |
| - Vikram Samvat | 460–461 |
| - Shaka Samvat | 325–326 |
| - Kali Yuga | 3504–3505 |
| Holocene calendar | 10404 |
| Iranian calendar | 218 BP – 217 BP |
| Islamic calendar | 225 BH – 224 BH |
| Javanese calendar | 287–288 |
| Julian calendar | 404 CDIV |
| Korean calendar | 2737 |
| Minguo calendar | 1508 before ROC 民前1508年 |
| Nanakshahi calendar | −1064 |
| Seleucid era | 715/716 AG |
| Thai solar calendar | 946–947 |
| Tibetan calendar | ཆུ་མོ་ཡོས་ལོ་ (female Water-Hare) 530 or 149 or −623 — to — ཤིང་ཕོ་འབྲུག་ལོ་ (male Wood-Dragon) 531 or 150 or −622 |
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404 (CDIV) was a leap year starting on Friday of the Julian calendar, the 404th year of the Common Era (CE) and Anno Domini (AD) designations, the 404th year of the 1st millennium, the 4th year of the 5th century, and the 5th year of the 400s decade. As of the start of 404, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.