如何从日期时间字符串中减去一小时，例如：“2017-04-20 11:46:00”并将其转换回PHP中的字符串？

Question

i need to subtract an hour from a string '2017-04-20 11:46:00' and convert it back to the same format. I have tried below function

<?php
$date = new DateTime('2017-04-20 11:46:00');
$tosub = new DateInterval('PT01H00M');
$result =date_format($tosub,"Y-m-d H:i:s");
echo $result;
?>

Answer 1

You need to apply the subtract function first, and then convert to the desired format.

$date    =    new DateTime('2017-04-20 11:46:00');
$tosub   =    new DateInterval('PT01H00M');
$result  =    $date->sub($tosub);       // Add subtract function
echo $result->format("Y-m-d H:i:s");