In PHP, despite the big choice of functions,
there is not a specific function to add an interval of time, that could
be a day, hour, month or year to a given date, therefore we have to
code something to do the job.
Date and time manipulation functions
In PHP, despite the big choice of functions, there is not a specific
function to add an interval of time, that could be a day, hour, month or year
to a given date, therefore we have to code something to do the job. In these
series of articles, I'll try to make some functions that could be
useful for your applications.
The first one is how to Add or Subtract days to today's date. We assume
that all the functions will be saved in a file called
php_functions.php
function add_day($days,$time_zone,$format){
$zone=3600*$time_zone;
$new_time = time() + $zone + ($days * 24 * 60 * 60);
$new_date=gmdate($format, $new_time);
return $new_date;
}
?>
Let's start explaining the above function, as you can see ,it has 3
parameters,
$days is where you put positive numbers for adding and negative
to subtract ,
$time_zone is your time zone that will be added to the GMT time
plus day light saving in summer if you have it, $format is where you put the
format you want the date to appear in your page.
$zone=3600*$time_zone; The variable $zone will hold the result of your
time zone by 3600 which are the seconds in 1 hour
$newtime will hold the timestamp resulting by adding time() with
$zone aand the result of the parameter $days by the seconds in a day.
$new_date is the final step, that, with the help of a PHP function
gmdate will transform a timestamp in a normal date.
See the example below
include 'php_functions.php';
$days= 2;
$time_zone=8;
$format='d-m-Y';
$today=add_day($days,$time_zone,$format);
echo $today;
?>
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