Counter mit inputfelder

Counter, der bis Datum x zählt. Counter kann jederzeit geändert werden durch die Input-Felder
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Der hier verwendete Code

<style>
*{
margin:0;
padding:0;
}
body{
height:100vh;
}
nav{
height:200px;
border:1px solid white;
background:black;
color:white;
}
nav span{
display:flex;
margin:3px 0;
border:1px solid white;
width:90%;
margin:10px auto;
padding:3px;
border-radius:5px;
}
input{
width:calc(100vw / 6);
}
input:focus{
border:2px solid green;
}
div{
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX