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Date and time manipulation functions

How to add or subtract days to a date -

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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

<?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, for complete formatting details, visit the PHP manual 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

<?php
include 'php_functions.php';
$days= 2;
$time_zone=8;
$format='d-m-Y';
$today=add_day($days,$time_zone,$format);
echo $today;
?>

Try the example below

Today date is	30-07-10
Days to add/subtract
Your time zone
The format you want
Your new date is

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Date and time manipulation functions

How to add or subtract days to a date -

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