php - One Hour Earlier Than Given Datetime

Question

I\'m having a problem here..

Supposed I have this kind of datetime.

$date = strtotime($date);

I need this to be converted into t

Answer 1

Nobody offered a DateTime object solution yet, so I will. It is the most modern method for handling datetime and doesn't require any calculation of minutes & seconds.

I always like to drop in some sort of timezone declaration to make things definitive. Daylight Saving Time is normally a concern with datetime manipulations, but probably okay in this case. Feel free to modify the timezone for your case.

PHP manual links:

• DateTime Object
• DateTime modify()
• DateTime getTimestamp()
• DateTime format()
• Timezone List

Code (including formatted time for comparison) Demo Link:

$now=new DateTime('NOW UTC');

$now_stamp=$now->getTimestamp();
$formatted_now=$now->format("Y-m-d H:i:s");
echo "$now_stamp ($formatted_now)\n";

$hour_ago=$now->modify('-1 hour');
$hour_ago_stamp=$hour_ago->getTimestamp();
$formatted_hour_ago=$hour_ago->format("Y-m-d H:i:s");
echo "$hour_ago_stamp ($formatted_hour_ago)";

Output:

1492687193 (2017-04-20 11:19:53)
1492683593 (2017-04-20 10:19:53)

Answer 2

strtotime will give you the unix timestamp of your date. From this timestamp, you then subtract your hour:

$date = strtotime($date) - 3600; // 3600 = 60 * 60

If you call strtotime($date - 3600), it's like obtaining the time for -3600 (e.g. strtotime(-3600)) which makes no sense because strtotime expects a string as first argument.

Answer 3

86400 seconds is one DAY, not one hour.

The output of strtotime() is a unix timestamp. 3600 seconds earlier is that timestamp minus one hour. So:

$date = strtotime($somestring);

$hourago = $date - 3600;

Or, depending on the original format of $somestring:

$hourago = strtotime($somestring . " - 1 hour");

And don't forget about date_default_timezone_set()

Answer 4

Try this query

$query= "insert into yourTable(otherValues, date) 
values (otherFields, DATE_ADD(NOW(),INTERVAL -1 hour))

Use DATE_ADD to insert a date value which is 1 hour less than current time.

Answer 5

You could do:

$testDateStr = strtotime($date);
$finalDate = date("Y-m-d H:i:s", strtotime("-1 hour", $testDateStr));

Hope it helps