Time format in mongoose scheema Object

I have schema object like below

 schedule: [{
        time: {
            type: Date,
            required: true
        }
    }]

and when I try to post data in postman as

"schedule":[
      {
         "time":"18:00:00"
      }]

I'm getting following error

validation failed: schedule.1.time: Cast to Date failed for value "12:00:00"

if I define type as String, everything is working fine.

I think I'm wrong at defining the type to accept the time. Can any one please help me to better way to define the object type

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