subtraction time

[alirezaok]

i have a variable. it has one time. (this varibale gives it's data from database)

echo $variable // print: 18:04:20

i want to subtraction 5 minutes from this variable
what should i do?

in this example this variable should print: 17:59:20

what should i do?

[pyro3k]

try this

$variable = "18:15:00";

$time = strtotime($variable);

$time = $time - 300;  // subtracts 5 mins ( 5*60 )

$formatedTime = date("H:i:s" , $time );

[alirezaok]

i want to use another way. usign of common string like as 5 days, 5 months, ... instead of seconds:

$date="2005-8-2";
$date1 = strtotime($date); 
$date2=strtotime('-5 days');
echo date($date1 , $date2);

but this code doesn't work. can you help me by this?

[Weedpacket]

 $date="2005-8-2";
$date1 = strtotime($date);
$date2=strtotime('-5 days');
echo date($date1 , $date2); 

But $date1 isn't a date format string, it's a timestamp.

[alirezaok]

so what should i do for using of common date string to subtraction to dates ?

[Weedpacket]

Try reading the manual page for [man]strtotime[/man]. It's all there.

int strtotime ( string time [, int now] )

The function expects to be given a string containing an English date format and will try to parse that format into a Unix timestamp (the number of seconds since January 1 1970 00:00:00 GMT), relative to the timestamp given in "now", or the current time if none is supplied. Upon failure, -1 is returned.

$time = strtotime("-5 minutes", $time);  // subtracts 5 mins