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28 different chronological periods, also depending on geographical contexts, are considered in CDLI for dating documents. These are:
| Period | Chronological Range |
|---|---|
| Pre-Writing | ca. 8500-3500 BC |
| Uruk V | ca. 3500-3350 BC |
| Uruk IV | ca. 3350-3200 BC |
| Uruk III | ca. 3200-3000 BC |
| Proto-Elamite | ca. 3100-2900 BC |
| ED I-II | ca. 2900-2700 BC |
| ED IIIa | ca. 2700-2500 BC |
| ED IIIb | ca. 2500-2340 BC |
| Ebla | ca. 2350-2250 BC |
| Old Akkadian | ca. 2340-2200 BC |
| Linear Elamite | ca. 2200 BC |
| Lagash II | ca. 2200-2100 BC |
| Harrapan | ca. 2200-1900 BC |
| Ur III | ca. 2100-2000 BC |
| Early Old Babylonian | ca. 2000-1900 BC |
| Old Assyrian | ca. 1950-1850 BC |
| Old Babylonian | ca. 1900-1600 BC |
| Middle Hittite | ca. 1500-1100 BC |
| Middle Babylonian | ca. 1400-1100 BC |
| Middle Assyrian | ca. 1400-1000 BC |
| Middle Elamite | ca. 1300-1100 BC |
| Neo Assyrian | 911-612 BC |
| Neo Elamite | 770-539 BC |
| Neo Babylonian | 626-539 BC |
| Achaemenid | 547-331 BC |
| Hellenistic | 323-63 BC |
| Parthian | 247 BC - 224 AD |
| Sassanian | 224-641 AD |
