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<html> <body> <input type="date" id="txtDOB" /> <button id="btnCalculate" onclick="fnCalculateAge();" >Calculate Age</button> <script> function fnCalculateAge(){ var userDateinput = document.getElementById("txtDOB").value; console.log(userDateinput); // convert user input value into date object var birthDate = new Date(userDateinput); console.log(" birthDate"+ birthDate); // get difference from current date; var difference=Date.now() - birthDate.getTime(); var ageDate = new Date(difference); var calculatedAge= Math.abs(ageDate.getUTCFullYear() - 1970); alert(calculatedAge); } </script> </body> </html>
Result :