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Quarterly Time Periods is a basic classification of the quarters of a calendar year.
This is a flat classification consisting of 5 categories, each with a 1-digit code.
| Code | Descriptor |
| 1 | Quarter 1 |
| 2 | Quarter 2 |
| 3 | Quarter 3 |
| 4 | Quarter 4 |
| 9 | Unknown |
The CSO Classifications Board approved the CSO Standard Quarterly Time Periods Classification (TXT 1KB) on May 6th 2004.
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