| Millennium: | 1st millennium |
|---|---|
| Centuries: | 1st century BC – 1st century – 2nd century |
| Decades: | 0s BC 0s 10s – 20s – 30s 40s 50s |
| Years: | 25 26 27 – 28 – 29 30 31 |
| 28 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 28 XXVIII |
| Ab urbe condita | 781 |
| Armenian calendar | N/A |
| Assyrian calendar | 4778 |
| Bahá'í calendar | -1816–-1815 |
| Bengali calendar | -565 |
| Berber calendar | 978 |
| English Regnal year | N/A |
| Buddhist calendar | 572 |
| Burmese calendar | -610 |
| Byzantine calendar | 5536–5537 |
| Chinese calendar | 丁亥年十一月十五日 (2664/2724-11-15) — to —
戊子年十一月廿六日(2665/2725-11-26) |
| Coptic calendar | -256–-255 |
| Ethiopian calendar | 20–21 |
| Hebrew calendar | 3788–3789 |
| Hindu calendars | |
| - Vikram Samvat | 84–85 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3129–3130 |
| Holocene calendar | 10028 |
| Iranian calendar | 594 BP – 593 BP |
| Islamic calendar | 612 BH – 611 BH |
| Japanese calendar | |
| Korean calendar | 2361 |
| Minguo calendar | 1884 before ROC 民前1884年 |
| Thai solar calendar | 571 |
Year 28 (XXVIII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Silanus and Nerva (or, less frequently, year 781 Ab urbe condita). The denomination 28 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.