We would like to suggest a new field type/format of time.

We have event type data we publish -- some of which are days and some of which have set start and end times.

We know we can use date or datetime but there is no time option

the highlighted ‘event’ goes across days so the system it comes from allows a date selector with no time.  As we are in GMT+10 it displays at 10am on the 17th May to 10am on the 19th May.  The actual event runs on 17, 18 and 19th May at differing times.