AD 4
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | AD 4 IV |
| Ab urbe condita | 757 |
| Assyrian calendar | 4754 |
| Bengali calendar | −589 |
| Berber calendar | 954 |
| Buddhist calendar | 548 |
| Burmese calendar | −634 |
| Byzantine calendar | 5512–5513 |
| Chinese calendar |
癸亥年 (Water Pig) 2700 or 2640 — to — 甲子年 (Wood Rat) 2701 or 2641 |
| Coptic calendar | −280 – −279 |
| Discordian calendar | 1170 |
| Ethiopian calendar | −4 – −3 |
| Hebrew calendar | 3764–3765 |
| Hindu calendars | |
| - Vikram Samvat | 60–61 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3104–3105 |
| Holocene calendar | 10004 |
| Iranian calendar | 618 BP – 617 BP |
| Islamic calendar | 637 BH – 636 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 4 IV |
| Korean calendar | 2337 |
| Minguo calendar | 1908 before ROC 民前1908年 |
| Nanakshahi calendar | −1464 |
| Seleucid era | 315/316 AG |
| Thai solar calendar | 546–547 |
AD 4 (IV) was a common year starting on Wednesday or a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a leap year starting on Tuesday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Catus and Saturninus (or, less frequently, year 757 Ab urbe condita). The denomination "AD 4" 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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