Description:
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I have use this date:-
 $exp_date = "2050-12-31 00:00:00";
$timestamp = strtotime($exp_date);

echo $timestamp;

But i got no timestamp value for it.

Also, I am using this following code:-
list($year, $month, $date) = explode('-', $exp_date);
$timestamp = mktime(0,0,0, $month,$date,$year);
echo $timestamp;

But i also got no timestamp value for it.

Test script:
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I have use this date:-
 $exp_date = "2050-12-31 00:00:00";
$timestamp = strtotime($exp_date);

echo $timestamp;


list($year, $month, $date) = explode('-', $exp_date);
$timestamp = mktime(0,0,0, $month,$date,$year);
echo $timestamp;



Expected result:
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It show return a timestamp value even after the year 2037. Till the year 2037 it is returning valid timestamp value, but after that it does not return any timestamp value.