How do I find next day date by end time ?

I have db with these details

Title (text)
Date Start Time (Timestamp)
Date End Time  (Timestamp)

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I will get input as

"This is title"
09/29/2014
11:55 PM
03:35 AM

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Now I need to calculate based on end time "03:35 AM".. the next day as "09/30/2014"?

How can I do this?

attached are my sample input screen.
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Loganathan NatarajanLAMP DeveloperAsked:
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Ray PaseurCommented:
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Ray PaseurCommented:
Now I need to calculate based on end time "03:35 AM".. the next day as "09/30/2014"?
How do you figure out that the next day is 09/30/2014?  Is this value always the current date + 1 day?  Give us a little more to go on, and I'll be glad to show you the calculations (or just read the article and you'll find many examples of date/time arithmetic).
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Loganathan NatarajanLAMP DeveloperAuthor Commented:
Thanks Ray, let me go through your article first.
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Ray PaseurCommented:
OK.  Once we know the rules for interpreting the times, it should be pretty easy to get the code together.
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Loganathan NatarajanLAMP DeveloperAuthor Commented:
I read the tutorial , it is useful and more details to work further. Thanks Ray.

but in my case different, just check the attachment screen. the input comes always one DATE and FROM, TO time ...

So, what is the best way to validate in my case?
doubt.png
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Ray PaseurCommented:
I'll try to show you what I think might work.  Install this script and run it, or test on my server here.
http://iconoun.com/demo/temp_loganathan.php
<?php // demo/temp_loganathan.php
error_reporting(E_ALL);
if (!empty($_GET))
{
    // INTERPRET THE DATES INTO TIMESTAMPS AND ISO-8601 DATETIME VALUES
    $alpha = date('c', strtotime($_GET['d'] . ' ' . $_GET['a']));
    $omega = date('c', strtotime($_GET['d'] . ' ' . $_GET['z']));

    // IF THE END DATE/TIME IS EARLIER THAN THE START, ADD A DAY
    if ($omega < $alpha) $omega = date('c', strtotime($omega . ' + 1 DAY'));

    // SHOW THE UNDERSTANDING OF THE DATES
    echo "Alpha: $alpha, Omega: $omega";
}

// CREATE THE FORM FOR INPUTS
$form = <<<EOF
<form>
Date:  <input name="d" /><br>
Start: <input name="a" /><br>
End:   <input name="z" /><br>
<input type="submit" value="Go!" />
</form>
EOF;
echo $form;

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Loganathan NatarajanLAMP DeveloperAuthor Commented:
Thanks ray. It is very helpful and fixed it.
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Ray PaseurCommented:
Great!  Thanks for the points, ~Ray
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