2.2.4 Inclusive Numbers: Dates
Use all digits in inclusive dates, whether the dates are BCE, CE, or common modern years. Do not shorten the second year in a date range.
correct |
506–501 BCE |
| 44 BCE–14 CE | |
| 156–159 CE | |
| the years 1914–1918 | |
| from 1939 to 1945 | |
| between 1967 and 1973 | |
| during the 1980s and 1990s |
Incorrect |
506–1 BCE |
| 156–59 CE | |
| from 1939–45 | |
| between 1967–73 | |
| during the 1980s and ’90s |
When a date range appears in a title, chapter title, or section heading, use all digits unless the cited source itself shortens the dates. In that case, preserve the form used in the original title.
For chronological era abbreviations, see §6.1.2: Historical Eras.