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| | Decimal Time - Stardates |
 | | These can be divided into two eras: the 23rd century, including the original series (TOS), the animated series and the first six movies, which used four digits (1234.5); the 24th century, including the The Next Generation, Deep Space 9, Voyager and the later movies, which used five digits (12345.6). |
 | | In the 24th century, the stardates generally progress by a fairly constant 1000 units per year, both in relation to 24th century dates given in episodes and to when episodes were actually released in the 20th and 21st centuries. |
 | | Working backwards, this gives an initial epoch of 2323, which is decades after when the original series and associated movies are set, suggesting that a different system was being used in the late 23rd century. |
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