codice:
<HTML>
<HEAD>
<TITLE>Esempi Javascript: esempio pratico </TITLE>
<SCRIPT LANGUAGE="JAVASCRIPT">
function lifetimer(){            

        today = new Date()          

        BirthDay = new Date(document.live.age.value)         

        timeold = (today.getTime() - BirthDay.getTime());         

        sectimeold = timeold / 1000;         

        secondsold = Math.floor(sectimeold);         

        msPerDay = 24 * 60 * 60 * 1000 ;         

        timeold = (today.getTime() - BirthDay.getTime());         

        e_daysold = timeold / msPerDay;         

        daysold = Math.floor(e_daysold);         

        e_hrsold = (e_daysold - daysold)*24;         

        hrsold = Math.floor(e_hrsold);         

        minsold = Math.floor((e_hrsold - hrsold)*60);           

        document.live.time1.value = daysold              

        document.live.time2.value = hrsold               

        document.live.time3.value = minsold              

        window.status = "In questo preciso istante hai " + secondsold + "............ secondi";         

        timerID = setTimeout("lifetimer()",1000)   

}        
</script>

</HEAD>

<BODY bgcolor="white">

<FORM name="live">

La tua data di nascita:<INPUT TYPE="text" NAME="age" VALUE="" SIZE=20> 

Esempio: (november 1,1966) 




<CENTER><INPUT TYPE="button" NAME="start" VALUE="Parti" ONCLICK="lifetimer(this.form)">

<INPUT TYPE="reset" NAME="resetb" VALUE="Ricomincia"></CENTER>





<CENTER><TABLE border=0>

<TR><TD>Tu hai, in giorni:</TD>

<TD>

<INPUT TYPE="text" NAME="time1" VALUE="" size=8>

</TD>

</TR>

<TR><TD>Tu hai, in ore:</TD>

<TD>

<INPUT TYPE="text" NAME="time2" VALUE="" size=8>

</TD>

</TR>

<TR><TD>Tu hai, in minuti:</TD>

<TD><INPUT TYPE="text" NAME="time3" VALUE="" size=8></TD>

</TR>

</TABLE></CENTER>



</body>
</html>
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