Information about the date and time of an event. Means of encoding a single date and time. The year (and optionally month, or month and day). The hour (and optionally minute, or minute and second) of the day. Means of encoding multiple individual dates and times. Means of encoding a range of dates and times. The first year (and optionally month, or month and day) of the event. The first hour (and optionally minute, or minute and second) of the day for the event. The last year (and optionally month, or month and day) for the event. The last hour (and optionally minute, or minute and second) of the day for the event.