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The aim of this database system is to build a gazetteer of calendar days in different calendar systems used in the Greek and Roman antiquity all across the mediterranean sea. Like geographical gazetteers this can be used to provide unique identifiers for each day in any of the calendar systems that has been used to refer to an astronomical day in any ancient source, be it papyri, ostraca or inscriptions. As a result ancient sources referring to the same day can be linked together, queries for dates and date ranges against the graph will return a set of ancient objects and texts. Where a clear system of conversions between different calendar systems has been established, dates will be converted to Julian etc. dates. As more and more dates from antiquity are linked to the system, a complex graph of ancient dated objects and texts evolves.