function ageCalculate(){ //document.getElementById('age').InnerHtml // document.getElementById("demo").InnerHtml=4+5; //document.write="Hi"; var birthDate =document.getElementById('birth_date').value; //if(birthDate==""){ // alert("Choose correct birthdate.") //}else{ // alert(birthDate); // alert(Date()); var d = new Date(birthDate); // document.getElementById("age").innerHTML = d; //} var mdate = birthDate.toString(); var yearThen = parseInt(mdate.substring(0,4), 10); var monthThen = parseInt(mdate.substring(5,7), 10); var dayThen = parseInt(mdate.substring(8,10), 10); var today = new Date(); var birthday = new Date(yearThen, monthThen-1, dayThen); // alert(today.valueOf() + " " + birthday.valueOf()); var differenceInMilisecond = today.valueOf() - birthday.valueOf(); // alert(differenceInMilisecond); var year_age = Math.floor(differenceInMilisecond / 31536000000); var day_age = Math.floor((differenceInMilisecond % 31536000000) / 86400000); if ((today.getMonth() == birthday.getMonth()) && (today.getDate() == birthday.getDate())) { alert("Happy B'day!!!"); } var month_age = Math.floor(day_age/30); day_age = day_age % 30; var tMnt= (month_age + (year_age*12)); var tDays =(tMnt*30) + day_age; if (isNaN(year_age) || isNaN(month_age) || isNaN(day_age)) { document.getElementById("age").innerHTML = ("Invalid birthday - Please try again!"); } else { document.getElementById("age").innerHTML = year_age + " years " + month_age + " months " + day_age + " days" + "
or
" + tMnt + " months " + day_age + " days" + "
or
" + tDays + " days" + "
or
" + tDays*24 + " hours" + "
or
" + tDays*24*3600 + " seconds" + "
or
" + tDays*24*3600*1000 + " miliseconds" ; } }

My code 2018/09/17 21:23