| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 610s 620s 630s 640s 650s 660s 670s |
| Years: | 639 640 641 642 643 644 645 |
| 642 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 642 DCXLII |
| Ab urbe condita | 1395 |
| Armenian calendar | 91 ԹՎ ՂԱ |
| Bahá'í calendar | -1202 – -1201 |
| Berber calendar | 1592 |
| Buddhist calendar | 1186 |
| Burmese calendar | 4 |
| Byzantine calendar | 6150 – 6151 |
| Chinese calendar | 辛丑年十一月廿五日 (3278/3338-11-25) — to —
壬寅年十二月初五日(3279/3339-12-5) |
| Coptic calendar | 358 – 359 |
| Ethiopian calendar | 634 – 635 |
| Hebrew calendar | 4402 – 4403 |
| Hindu calendars | |
| - Vikram Samvat | 697 – 698 |
| - Shaka Samvat | 564 – 565 |
| - Kali Yuga | 3743 – 3744 |
| Holocene calendar | 10642 |
| Iranian calendar | 20 – 21 |
| Islamic calendar | 21 – 22 |
| Japanese calendar | |
| Korean calendar | 2975 |
| Thai solar calendar | 1185 |
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