I just tested in my UIM 8.47 lab the following and this worked
{
"name": "Test Sched B",
"description": "Test schedule for Maintenance Mode REST API-B.",
"start_date_time": {
"month": "12",
"day": "29",
"year": "2017",
"timestamp": {
"hours": "15",
"minutes": "50",
"seconds": "01"
}
},
"end_time": {
"type": "duration",
"end_date_time": {
"month": "12",
"day": "30",
"year": "2017",
"timestamp": {
"hours": "15",
"minutes": "55",
"seconds": "01"
}
},
"duration": {
"hours": "24",
"minutes": "",
"seconds": ""
}
},
"account_id": "",
"recurrence_pattern": "",
"recurrence_period": "",
"recurrence_days_of_the_week": "",
"recurrence_day_of_the_month": "",
"recurrence_instance": "",
"recurrence_end_date_time": {
"month": "",
"day": "",
"year": "",
"timestamp": {
"hours": "",
"minutes": "",
"seconds": ""
}
},
"timezone": "Canada/Pacific"
}
I would suggest you open a Support case as I think we webex migbht be needed