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const input = document.getElementById('input'); const button = document.getElementById('button'); const ans = document.getElementById('ans'); button.addEventListener('click', function(){ const birthdate = new Date(input.value); if(birthdate){ const today = new Date(); var age = today.getFullYear() - birthdate.getFullYear(); var month = today.getMonth() - birthdate.getMonth(); var date = today.getDate() - birthdate.getDate(); if(month < 0 || (month === 0 && date < 0 )){ age--; } ans.innerHTML = age; } });
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