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Calendar Years is a basic classification of calendar years from 1841 to 2050.
This is a flat classification consisting of 211 categories, each with a 4-digit code, e.g.
| Code | Descriptor |
| 1841 | 1841 |
| 1842 | 1842 |
| 2023 | 2023 |
| 2024 | 2024 |
| 9999 | Unknown |
The CSO Classification Board approved the basis of the CSO Standard Years Classification (TXT 2KB) on May 6th 2004.
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