W3C Invites Implementations of Time Ontology in OWL
![Thirteen elementary possible relations between time periods](https://www.w3.org/TR/2017/CR-owl-time-20170606/images/IntervalRelations.png)
The Spatial Data on the Web Working Group invites implementations of Time Ontology in OWL Candidate Recommendation. The ontology provides a vocabulary for expressing facts about topological (ordering) relations among instants and intervals, together with information about durations, and about temporal position including date-time information. Time positions and durations may be expressed using either the conventional (Gregorian) calendar and clock, or using another temporal reference system such as Unix-time, geologic time, or different calendars.