Adding together time hh:mm:ss to a total

**Lick** · May 14 '07, 07:52 PM

You will have to write code that first counts the seconds and see if they overflow the 59 seconds limit. If they overflow, you add 1 to the minute calculation.

Next, you count the minutes and see if they overflow the 59 minutes limit. If they overflow, you add 1 to the hours calculation.
Note: don't forget to add the 1 from the previous calculation, if applicable.

Next, you count the hours and if applicable, add 1 from the previous calculation.

**pbmods** · May 15 '07, 03:44 AM

Here's how I would do it:

Assuming the times don't span multiple days, pick a random day. For example, '2007-05-14' (to pick a random one). Then prepend the date to your times and calculate their unix timestamps.

Then, all you have to do is add up the differences between your times and midnight of the same day:

[code=php]
var $date = '2007-05-14';
var $datetime = strtotime("$dat e 00:00:00");

// These are examples; you'll probably want to pull your numbers from the DB.
var $times = array(
'01:15:45',
'03:11:02',
'10:15:45'
);

var $sum = 0;
foreach($times as $time) {
$sum += strtotime("$dat e $time") - $datetime;
}

// $sum holds the total number of seconds of all three times.
print($sum);
[/code]

When the loop executes the first time, we are computing the difference between two datetimes:

[code=php]
$sum += strtotime('2007-05-14 01:15:45') - strtotime('2007-05-14 00:00:00');
[/code]

You're taking the number of seconds from January 1, 1979 (or something like that) until May 14, 2007 at 1:15 AM and 45 seconds. Then you take the number of seconds from January 1, 1979 until May 14, 2007 at midnight and subtract the two numbers.

Since May 14, 2007 01:15:45 occurred exactly 1 hour, 15 minutes and 45 seconds after May 14, 2007 00:00:00, $sum has just been +='ed to the number of seconds in 1 hour, 15 minutes and 45 seconds (4515).

Continue through the loop with the rest of your values, and you've got yourself a handy little time-summer.

Now the trick comes into play when your times span >1 day. But the fix for that isn't too difficult ;)

**skillednerd** · Jul 2 '07, 02:27 AM

[code=php]list($h, $m, $s) = split('[:]', $time_1_here);
list($h2, $m2, $s2) = split('[:]', $time_2_here);

$h = ($h * 60) * 60;
$m = $m * 60;
$h2 = ($h2 * 60) * 60;
$m2 = $m2 * 60;

$x = $h + $m + $s;
$x2 = $h2 + $m2 + $s2;

$y = $x + $x2;

$y = $y / 60;
$y = $y / 60;

echo $y;[/code]

[Please use CODE tags when posting source code. Thanks! --pbmods]

**kovik** · Jul 2 '07, 03:14 PM

You know, the reason timestamps were ever used is because you can calculate the difference between them with simple subtraction. You can use mktime() to turn the dates into timestamps, and then do this:

[code=php]$end - $start = $timeTaken;
$years = date('Y', $timeTaken) - 1970; // because timestamps start at 1970
$months = date('n', $timeTaken);
$days = date('j', $timeTaken);[/code]

**helalreza** · Oct 4 '16, 03:22 AM

Code:

<body>
<input type="time" step="1" id="startTimeInput"  name="start_time" value=""><br>     <!--   write as like       02:31:55   -->
<input  type="time" step="1" id="endTimeInput"  name="end_time" value=""><br>
<button id="calcBtn">Seconds</button><br>
<div id="result"></div>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
document.getElementById('calcBtn').onclick = function(){
	var startTime = document.getElementById('startTimeInput').value;
	var endTime = document.getElementById('endTimeInput').value;
  var result = getDeltaSeconds(startTime, endTime);
  document.getElementById('result').innerHTML = result + ' sec';
}
function getDeltaSeconds(startTime, endTime){
	var startTimeSeconds = getSeconds(startTime);
  var endTimeSeconds = getSeconds(endTime);
  return endTimeSeconds - startTimeSeconds;	
}
function getSeconds(timeString){
	var parts = timeString.split(' ');
  var time = parts[0];
  var ampm = parts[1];
  var timeParts = time.split(':');
  var seconds = Number(timeParts[2]) + Number(timeParts[1]*60) + Number(timeParts[0]*60*60);
  return ampm == 'AM' ? seconds : seconds + 12*60*60;
}
</script>
</body>

Adding together time hh:mm:ss to a total

Adding together time hh:mm:ss to a total

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