TestDateTime

TestDateTime.php

<?php 

/**
 * function to check whether a date is within the last 30 days
 */
function withinOneMonth ($checkDate) {
  
  $now = new DateTime();
  
  $thirtyDayInterval = new DateInterval('P30D');
  
  /* create a date 30 days in the past */
  $before = $now->sub($thirtyDayInterval);
  
  return ($checkDate > $before);
}

/* today's date is 7th of March 2014 */

/* 7 days ago, 28th of February */
echo (withinOneMonth(new DateTime('2014-02-28 00:00:00+11:00'))) ? 
  'within 30 days' : 'NOT within 30 days';
// echos 'within 30 days'

/* 29 days ago, 6th of February */
echo (withinOneMonth(new DateTime('2014-02-06 00:00:00+11:00'))) ? 
  'within 30 days' : 'NOT within 30 days';
// echos 'within 30 days'

/* 31 days ago, 4th of February */
echo (withinOneMonth(new DateTime('2014-02-04 00:00:00+11:00'))) ? 
  'within 30 days' : 'NOT within 30 days';
// echos 'NOT within 30 days'