IFC (IFC4X3_ADD2) under development IfcTime Semantic definition

The IfcTime identifies a time within a day, expressed by hours, minutes and second. It is expressed by a string value following a particular lexical representation.

The lexical representation for IfcTime is: hh:mm:ss where where hh represents hours, mm minutes and ss seconds. Additional digits can be used to increase the precision of fractional seconds if desired i.e the format ss.ss... A time zone indicator may be provided by a representation of the different to the Coordinated Universal Time. It is appended with a sign [+/-] followed by hh and optionally :mm. Formal representation

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