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The six-hour clock (Italian: sistema orario a 6 ore), also called the Roman (alla romana) or the Italian (all'italiana) system, is a timekeeping system used in Italy. In this system, the day starts at the evening Ave Maria at the end of twilight, approximately half an hour after sunset, and the following 24 hours are divided into four cycles of six hours each.
- 12-hour clock
- 24-hour clock
- Date and time notation in Italy
- The Thai six-hour clock, another six-hour system.
- Time in Italy
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- Severino, Nicola (2011), La misteriosa storia degli orologi a sei ore. (in Italian)