timeline chart date-time problem

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Correction - Under Formate there is Date formats to select, and there are Time formats to select, but not combined Date and Time formats to select.

Also, if I select Date and Time under Calendar view, it always saves as Date only. I want a timeline not a calendar view, so I don't know if this matters.

Thanks

I created a timeline with display of one day only and to have the timeline shown in hours only on a single day. (8 to 10, 11 to 12, 13 to 14, amd 15 to 16)

here is my error when I select preview timeline.

DateTime::__construct(): Failed to parse time string (2016-12-05 08-00-00) at position 11 (0): Double date specification

Under Formate field, the only selections are Date or Time, not Date and Time.

Under Show Calendar Display field, there is a selection for Date (various formats) and Time (various formats), but not both date and time.

There is no date field for Date (YYYY-mm-dd) to select under Formate.

I also tried to change the date and time by hand but it doesn't work either.

Am I missing something? thanks