dateValidation.js

    getDate: function(driverDobParam) {
        const givenDate = driverDobParam || this.state.formDob || this.props.dob;
        const timestamp = Date.parse(givenDate);
        let dateGiven;
        if (!isNaN(timestamp)) {
            dateGiven = new Date(timestamp);
        }
        return dateGiven;
    },
    validatedDate: function(givenDate) {
        const thisYear = (new Date()).getFullYear();
        const oldestYear = thisYear - 116;
        return givenDate >= oldestYear && givenDate <= this.minDriverDob;
    },
    isValid: function(driverDobParam) {
        const finalDate = this.getDate(driverDobParam);
        let isValid;
        if (!finalDate) {
            isValid = false;
        }
        else {
            isValid = this.validatedDate(finalDate);
        }
        return isValid;
    }