here is an example of something that can submit the user's time at the time of submission of a form - of course this will only be as accurate as the time for submission between browser and server, and may be a few seconds off:
<script language="javascript" type="text/javascript">
function beginSubmit_i2(){
try{
var yom=new Date();
document.getElementById('postTime').value=yom;
EXs=screen;
var sw=EXs.width;
var sh=EXs.height;
navigator.appName!="Netscape"? cd=EXs.colorDepth:cd=EXs.pixelDepth;
document.getElementById('environment').value=sw+'x'+sh+'; '+cd;
}catch(e){ }
}
</script>
<form action="index_01_exe.php" method="post" name="form1" target="w1" onSubmit="beginSubmit_i2();">
<table>
<tr>
<td>User
Name:</td>
<td>
<input type="text" name="UN" id="UN" value="">
<script>document.getElementById('UN').focus()</script>
</td>
</tr>
<tr>
<td>Password:</td>
<td>
<input type="password" name="PW" value="">
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="Submit" id="Submit1" value="Sign In">
<input type="hidden" name="src" value="">
<input name="postTime" type="hidden" id="postTime">
<input name="environment" type="hidden" id="environment">
<input name="mode" type="hidden" id="mode" value="login">
<input name="testmode" type="hidden" id="testmode" value="">
<span id="SubmitStatus1"> </span>
</td>
</tr>
</table>
<br>
For a forgotten password <a href="forgot_password.php">click here</a>.
</form>