What could be the significance of the last two digits in the Gmail header date format?

The last two digits in the Gmail header date format represent the seconds of the timestamp. However, some email clients may not display the seconds accurately or at all, causing potential discrepancies in the displayed time. To ensure accuracy and consistency in displaying the timestamp, it is recommended to remove the last two digits (representing seconds) from the date format. 

// Original Gmail header date format: "Tue, 15 Jun 2021 12:34:56 +0000"
// Remove the last two digits (seconds) for consistency
$date = "Tue, 15 Jun 2021 12:34:56 +0000";
$newDate = preg_replace('/\d{2} \+\d{4}$/', '', $date);

echo $newDate; // Output: "Tue, 15 Jun 2021 12:34 +0000"

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Gmail header date format significance last two digits PHP

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