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              <body>
<p>Πατήστε το κουμπί για να δείτε ένα χαιρετισμό ανάλογα με την ώρα της ημέρας.</p>
<button onclick="Function1()">ΔΟΚΙΜΑΣΤΕ</button>
<p id="test1"></p>
<hr>
 <p>Πατήστε το κουμπί για να δείτε ένα χαιρετισμό ανάλογα με την ώρα της ημέρας(με περισσότερες επιλογές).</p>
<button onclick="Function2()">ΔΟΚΙΜΑΣΤΕ</button>
<p id="test2"></p>
<hr>
 <p>Πατήστε το κουμπί για να δείτε τι μέρα είναι σήμερα.</p>
<button onclick="Function3()">ΔΟΚΙΜΑΣΤΕ</button>
<p id="test3"></p>

</body>
            
          
!
            
              function Function1() {
    var hour = new Date().getHours(); 
    var greeting;
    if (hour < 12) {
        greeting = "ΚΑΛΗΜΕΡΑ";
    } else {
        greeting = "ΚΑΛΗΣΠΕΡΑ";
    }
    document.getElementById("test1").innerHTML = greeting;
}

function Function2() {
    var greeting;
    var time = new Date().getHours();
    if (time < 12) {
        greeting = "ΚΑΛΗΜΕΡΑ";
    } else if (time < 22) {
        greeting = "ΚΑΛΗΣΠΕΡΑ";
    } else {
        greeting = "ΚΑΛΗΝΥΧΤΑ";
    }
document.getElementById("test2").innerHTML = greeting;
}

function Function3(){
 var day;
switch (new Date().getDay()) {
    case 0:
        day = "ΚΥΡΙΑΚΗ";
        break;
    case 1:
        day = "ΔΕΥΤΕΡΑ";
        break;
    case 2:
        day = "ΤΡΙΤΗ";
        break;
    case 3:
        day = "ΤΕΤΑΡΤΗ";
        break;
    case 4:
        day = "ΠΕΜΠΤΗ";
        break;
    case 5:
        day = "ΠΑΡΑΣΚΕΥΗ";
        break;
    case  6:
        day = "ΣΑΒΒΑΤΟ";
        break;
}
document.getElementById("test3").innerHTML = "ΣΗΜΕΡΑ ΕΙΝΑΙ " + day;
  
}
            
          
!
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