Represents a specific instant of time. It has the form YYYY- MM- DD hh: mm: ss folowed by an optional time-zone suffix. YYYY is the year, MM is the month number, DD is the day number, hh the hour in 24-hour format, mm the minute, and ss the second (a decimal and fraction are allowed for the seconds part). The optional zone suffix is either for Universal Coordinate Time (UCT), or a time offset of the form " hh: mm", giving the difference between UCT and local time in hours and minutes. Example: "2004-10-31T21:40:35.5-07:00" is a time on Halloween 2004 in Mountain Standard time. The equivalent UCT would be "2004-11-01T02:40:35.5Z".