The following is really easy way to subtract one hour in current date and time using PHP. Using the date function to set the format of the date to be returned then using strtotime. You may also like How to Subtract Minutes to Date and Time in PHP and How to Add Hours to Date and Time in PHP.
<?php $start = date('Y-m-d H:i:s'); echo date('Y-m-d H:i:s',strtotime('-1 hour',strtotime($start))); ?>
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