How to use the ngx-custom-validators.CustomValidators.date function in ngx-custom-validators

},
    required: {
      func: Validators.required
    },
    requiredTrue: {
      func: Validators.requiredTrue
    },
    base64: {
      func: CustomValidators.base64,
      params: ["min"]
    },
    creditCard: {
      func: CustomValidators.creditCard
    },
    date: {
      func: CustomValidators.date
    },
    dateISO: {
      func: CustomValidators.dateISO
    },
    digits: {
      func: CustomValidators.digits
    },
    equal: {
      func: CustomValidators.equal,
      params: ["equal"]
    },
    equalTo: {
      func: CustomValidators.equalTo,
      params: ["equalTo"]
    },
    gt: {

const foundEqualToControl = availableControls[validator.validatorOption]
                        if (!!foundEqualToControl) {
                            formValidators.push(CustomValidators.equalTo(foundEqualToControl))
                        }
                        break
                    case ValidatorType.Email:
                        formValidators.push(CustomValidators.email)
                        break
                    case ValidatorType.Number:
                        formValidators.push(CustomValidators.number)
                        break
                    case ValidatorType.NumberRange:
                        formValidators.push(CustomValidators.range(JSON.parse(validator.validatorOption)))
                        break
                    case ValidatorType.DateTime:
                        formValidators.push(CustomValidators.date)
                        break
                    case ValidatorType.MinDate:
                        formValidators.push(CustomValidators.minDate(validator.validatorOption))
                        break
                    case ValidatorType.MaxDate:
                        formValidators.push(CustomValidators.maxDate(validator.validatorOption))
                        break
                    case ValidatorType.Regex:
                        formValidators.push(Validators.pattern(validator.validatorOption))
                        break
                    case ValidatorType.MinLength:
                        formValidators.push(Validators.minLength(parseInt(validator.validatorOption)))
                        break
                    case ValidatorType.MaxLength:
                        formValidators.push(Validators.maxLength(parseInt(validator.validatorOption)))
                        break