script.js

function birthDay(){
    var date = document.getElementById('date').value;
    var month = document.getElementById('month').value;
    var year = document.getElementById('year').value;

    var century = year.slice(0,2);
    var DOB = year.slice(2,4);

    var userGender = document.getElementById("gender");
    var gender = userGender.options[userGender.selectedIndex].text;

    var male = ["Kwasi", "Kwadwo", "Kwabena", "Kwaku", "Yaw", "Kofi", "Kwame"];
    var female = ["Akosu", "Adwoa", "Abenaa", "Akua", "Yaa", "Afua", "Amna"];
    var dayOfWeek = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Sunday"];
    
    var day = ( ( (century/4) -2*year-1) + ((5*year/4) ) + ((26*(month+1)/10)) + date ) % 7;
    var dayOfBirth = Math.floor(day);
    

    if (gender === "Male"){
        document.getElementById("result").innerHTML = "Your DOB is " + dayOfWeek[dayOfBirth - 1]+ "and your akan name is " + male[dayOfBirth - 1];
    }
    else if (gender === "Female") {
        document.getElementById("result").innerHTML = "Your DOB is " + dayOfWeek[dayOfBirth -1]+ "  and your name is " +  female[dayOfBirth -1];
    }     
}
function validateForm() {
    let day = document.forms["myForm"]["date"].value;
    if (day == "") {
      alert("Date must be filled out");
      return false;
    }
    
  }