google.type.TimeOfDay(TimeOfDay)

Represents a time of day. The date and time zone are either not significant
or are specified elsewhere. An API may choose to allow leap seconds. Related
types are [google.type.Date][google.type.Date] and
google.protobuf.Timestamp.

{
    "hours": 0,
    "minutes": 0,
    "seconds": 0,
    "nanos": 0
}