Timestamp Unix epoch problem

This is correct ?

How i can pass this parameter string (01/08/2018 00:00:00) to recive (1552562340) in query string

        - name: timestamp
          in: query
          required: true
          description: Tempo formato Unix epoch
          #1552562340 (01/08/2018 00:00:00 GMT)
          schema:
            type: string
            format: unix-timestamp
        - name: signature
          in: query