ISO 10303-214:2010(E)
A Date_time is the specification of a date and an optional time of day.
The representation of date and time shall be according to ISO 8601.
The data associated with a Date_time are the following:
The date specifies the calendar time, defined according to the Gregorian calendar, conveying information about the year, the month, and the day in no specific order. The representation of a date shall be complete, i.e., millennium, century, and year-within-century data shall be included.
The time specifies a moment of occurrence measured by hour, minute, and second.
The time need not be specified for a particular Date_time.
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