| Years |
|---|
| Millennium |
| 1st millennium |
| Centuries |
| Decades |
| Years |
| 42 by topic |
|---|
| Arts, history, and science |
| Countries |
|
|
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | AD 42 XLII |
| Ab urbe condita | 795 |
| Assyrian calendar | 4792 |
| Balinese saka calendar | N/A |
| Bengali calendar | −551 |
| Berber calendar | 992 |
| Buddhist calendar | 586 |
| Burmese calendar | −596 |
| Byzantine calendar | 5550–5551 |
| Chinese calendar | 辛丑年 (Metal Ox) 2738 or 2678 — to — 壬寅年 (Water Tiger) 2739 or 2679 |
| Coptic calendar | −242 – −241 |
| Discordian calendar | 1208 |
| Ethiopian calendar | 34–35 |
| Hebrew calendar | 3802–3803 |
| Hindu calendars | |
| - Vikram Samvat | 98–99 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3142–3143 |
| Holocene calendar | 10042 |
| Iranian calendar | 580 BP – 579 BP |
| Islamic calendar | 598 BH – 597 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 42 XLII |
| Korean calendar | 2375 |
| Minguo calendar | 1870 before ROC 民前1870年 |
| Nanakshahi calendar | −1426 |
| Seleucid era | 353/354 AG |
| Thai solar calendar | 584–585 |
| Tibetan calendar | ལྕགས་མོ་གླང་ལོ་ (female Iron-Ox) 168 or −213 or −985 — to — ཆུ་ཕོ་སྟག་ལོ་ (male Water-Tiger) 169 or −212 or −984 |
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42 is a year in the 1st century. It was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Piso.