642
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 642 DCXLII |
| Ab urbe condita | 1395 |
| Armenian calendar | 91 ԹՎ ՂԱ |
| Assyrian calendar | 5392 |
| Bengali calendar | 49 |
| Berber calendar | 1592 |
| Buddhist calendar | 1186 |
| Burmese calendar | 4 |
| Byzantine calendar | 6150–6151 |
| Chinese calendar |
辛丑年 (Metal Ox) 3338 or 3278 — to — 壬寅年 (Water Tiger) 3339 or 3279 |
| Coptic calendar | 358–359 |
| Discordian calendar | 1808 |
| Ethiopian calendar | 634–635 |
| Hebrew calendar | 4402–4403 |
| Hindu calendars | |
| - Vikram Samvat | 698–699 |
| - Shaka Samvat | 563–564 |
| - Kali Yuga | 3742–3743 |
| Holocene calendar | 10642 |
| Iranian calendar | 20–21 |
| Islamic calendar | 21–22 |
| Japanese calendar | N/A |
| Javanese calendar | 532–533 |
| Julian calendar | 642 DCXLII |
| Korean calendar | 2975 |
| Minguo calendar | 1270 before ROC 民前1270年 |
| Nanakshahi calendar | −826 |
| Seleucid era | 953/954 AG |
| Thai solar calendar | 1184–1185 |
Year 642 (DCXLII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 642 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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