I want to offer you to use time.parser option instead of modifying the data:

time: {
    unit: "hour",
    displayFormats: {
      hour: "HH:mm"
    }
  },
  parser: (value: Date) => {
    return new Date(
      value.getUTCFullYear(),
      value.getUTCMonth(),
      value.getUTCDate(),
      value.getUTCHours(),
      value.getUTCMinutes(),
      value.getUTCSeconds()
    );
  }
}```