createFromSql(sqlDate) {
        const parts = sqlDate.split('-');
        const year = parts[0];
        const monthStr = parts[1];
        const dayStr = parts[2];
        return this.create(year, monthStr, dayStr);
    }
Creates Date object from SQL Date string, for example, '2016-07-14'

@param {String} sqlDate

@returns {Date|boolean}