309
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 309 CCCIX |
| Ab urbe condita | 1062 |
| Assyrian calendar | 5059 |
| Bengali calendar | −284 |
| Berber calendar | 1259 |
| Buddhist calendar | 853 |
| Burmese calendar | −329 |
| Byzantine calendar | 5817–5818 |
| Chinese calendar |
戊辰年 (Earth Dragon) 3005 or 2945 — to — 己巳年 (Earth Snake) 3006 or 2946 |
| Coptic calendar | 25–26 |
| Discordian calendar | 1475 |
| Ethiopian calendar | 301–302 |
| Hebrew calendar | 4069–4070 |
| Hindu calendars | |
| - Vikram Samvat | 365–366 |
| - Shaka Samvat | 230–231 |
| - Kali Yuga | 3409–3410 |
| Holocene calendar | 10309 |
| Iranian calendar | 313 BP – 312 BP |
| Islamic calendar | 323 BH – 322 BH |
| Javanese calendar | 189–190 |
| Julian calendar | 309 CCCIX |
| Korean calendar | 2642 |
| Minguo calendar | 1603 before ROC 民前1603年 |
| Nanakshahi calendar | −1159 |
| Seleucid era | 620/621 AG |
| Thai solar calendar | 851–852 |
Year 309 (CCCIX) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Licinianus and Constantius (or, less frequently, year 1062 Ab urbe condita). The denomination 309 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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