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| Years |
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| Millennium |
| 1st millennium |
| Centuries |
| Decades |
| Years |
| 90 by topic |
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| Arts, history, and science |
| Countries |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | AD 90 XC |
| Ab urbe condita | 843 |
| Assyrian calendar | 4840 |
| Balinese saka calendar | 11–12 |
| Bengali calendar | −503 |
| Berber calendar | 1040 |
| Buddhist calendar | 634 |
| Burmese calendar | −548 |
| Byzantine calendar | 5598–5599 |
| Chinese calendar | 己丑年 (Earth Ox) 2786 or 2726 — to — 庚寅年 (Metal Tiger) 2787 or 2727 |
| Coptic calendar | −194 – −193 |
| Discordian calendar | 1256 |
| Ethiopian calendar | 82–83 |
| Hebrew calendar | 3850–3851 |
| Hindu calendars | |
| - Vikram Samvat | 146–147 |
| - Shaka Samvat | 11–12 |
| - Kali Yuga | 3190–3191 |
| Holocene calendar | 10090 |
| Iranian calendar | 532 BP – 531 BP |
| Islamic calendar | 548 BH – 547 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 90 XC |
| Korean calendar | 2423 |
| Minguo calendar | 1822 before ROC 民前1822年 |
| Nanakshahi calendar | −1378 |
| Seleucid era | 401/402 AG |
| Thai solar calendar | 632–633 |
| Tibetan calendar | ས་མོ་གླང་ལོ་ (female Earth-Ox) 216 or −165 or −937 — to — ལྕགས་ཕོ་སྟག་ལོ་ (male Iron-Tiger) 217 or −164 or −936 |
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AD 90 (XC) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Domitian and Nerva (or, less frequently, year 843 Ab urbe condita). The denomination AD 90 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.