Days of the Month is a basic classification of the days of the month.
This is a flat classification consisting of 32 categories, each with a 2-digit code.
| Code | Descriptor |
| 01 | 1st |
| 02 | 2nd |
| 03 | 3rd |
| 04 | 4th |
| 05 | 5th |
| 06 | 6th |
| 07 | 7th |
| 08 | 8th |
| 09 | 9th |
| 10 | 10th |
| 11 | 11th |
| 12 | 12th |
| 13 | 13th |
| 14 | 14th |
| 15 | 15th |
| 16 | 16th |
| 17 | 17th |
| 18 | 18th |
| 19 | 19th |
| 20 | 20th |
| 21 | 21st |
| 22 | 22nd |
| 23 | 23rd |
| 24 | 24th |
| 25 | 25th |
| 26 | 26th |
| 27 | 27th |
| 28 | 28th |
| 29 | 29th |
| 30 | 30th |
| 31 | 31st |
| 99 | Unknown |
The CSO Classifications Board approved the CSO Standard Days of the Month Classification (TXT 1KB) classification on May 6th 2004.
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