fedcde2f_on_next_JSON___Document_Format__Data_Type_HTML5_
[Type] datetime [State(HTML5)] Date and Time [Data Type(Collection+JSON)] STRING [Data Type(HTML5)] 
A date and time (year, month, day, hour, minute, second, fraction of a second) with the time zone set to UTC
Collection.next+JSON - Document Format
Data Type(HTML5)