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                <input type="date" id="date" value ="2020-04-04">
<input type="button" onclick='calculate()' value='Calc'><br>
<div id="log"><div>




                function calculate(){
  //поле введення як об'єкт
  const input_object = document.getElementById("date");
  //значення, введене у поле - стрічка
  const date_as_string = input_object.value; 
  //дата як об'єкт, а не як стрічка
  const user_input_date = new Date(date_as_string);
  //поточний час
  const now_date = new Date();  
  //різниця у секундах
  const diff_in_seconds = (now_date - user_input_date) / 1000;
  log.innerHTML += 'Між '+now_date+' і '+user_input_date+' минуло '+ diff_in_seconds+' секунд<br>';