Missing End Time Google Calendar

This guy had the answer

https://groups.google.com/forum/#!msg/google-calendar-api/cnkgXfy_GQQ/SRV1N0TAGtYJ

    var object = {        'end': {            'dateTime': '2014-07-28T23:00:00',//end,            'timeZone': timeZone        },        'start': {            'dateTime': '2014-07-28T18:00:00',//start,            'timeZone': timeZone        }        //'summary': artist,        //'description': description,        //'location': address    };    var calendarObject =    {        'calendarId': calendarId,        'resource': object    };    var request = gapi.client.calendar.events.insert(calendarObject);

Probably, the reason of this error not wrong time. Probably, Calendar API can't recognize you json. Header of http-request MUST contain "Content-Type: application/json". See here http://devsplanet.com/question/37535563

This worked for me:

var event = {      summary: "Google I/O 2015",      location: "800 Howard St., San Francisco, CA 94103",      description: "A chance to hear more about Google's developer products.",      start: {        date: "2020-05-28"      },      end: {        date: "2020-05-29"      }    };    gapi.client.calendar.events      .insert({        calendarId: calendarId,        resource: event      })