| Millennium: | 1st Millennium BC |
|---|---|
| Centuries: | 8th cent. BC – 7th cent. BC – 6th cent. BC |
| Decades: | 650s BC 640s BC 630s BC – 620s BC – 610s BC 600s BC 590s BC |
| Years: | 623 BC 622 BC 621 BC – 620 BC – 619 BC 618 BC 617 BC |
| Gregorian calendar | 620 DCXX |
| Ab urbe condita | 1373 |
| Armenian calendar | 69 ԹՎ ԿԹ |
| Assyrian calendar | 5370 |
| Bengali calendar | 27 |
| Berber calendar | 1570 |
| Buddhist calendar | 1164 |
| Burmese calendar | −18 |
| Byzantine calendar | 6128–6129 |
| Chinese calendar | 己卯年 (Earth Rabbit) 3316 or 3256 — to — 庚辰年 (Metal Dragon) 3317 or 3257 |
| Coptic calendar | 336–337 |
| Discordian calendar | 1786 |
| Ethiopian calendar | 612–613 |
| Hebrew calendar | 4380–4381 |
| Hindu calendars | |
| - Vikram Samvat | 676–677 |
| - Shaka Samvat | 541–542 |
| - Kali Yuga | 3720–3721 |
| Holocene calendar | 10620 |
| Iranian calendar | 2 BP – 1 BP |
| Islamic calendar | 2 BH – 1 BH |
| Japanese calendar | N/A |
| Javanese calendar | 510–511 |
| Julian calendar | 620 DCXX |
| Korean calendar | 2953 |
| Minguo calendar | 1292 before ROC 民前1292年 |
| Nanakshahi calendar | −848 |
| Seleucid era | 931/932 AG |
| Thai solar calendar | 1162–1163 |
The year 620 BC