public static function diferencia_fechas($fecha_1, $fecha_2)
{
if (Date_time::restar_fechas($fecha_1, $fecha_2) < 0) {
$fecha_inicio_array = explode("-", $fecha_2);
$fecha_fin_array = explode("-", $fecha_1);
} else {
$fecha_inicio_array = explode("-", $fecha_1);
$fecha_fin_array = explode("-", $fecha_2);
}
// configure the base date here
$base_day = (int) $fecha_inicio_array[2];
// no leading "0"
$base_mon = (int) $fecha_inicio_array[1];
// no leading "0"
$base_yr = $fecha_inicio_array[0];
// use 4 digit years!
// get the current date (today) -- change this if you need a fixed date
$current_day = (int) $fecha_fin_array[2];
$current_mon = (int) $fecha_fin_array[1];
$current_yr = $fecha_fin_array[0];
// and now .... calculate the difference! :-)
// overflow is always caused by max days of $base_mon
// so we need to know how many days $base_mon had
$base_mon_max = date("t", mktime(0, 0, 0, $base_mon, $base_day, $base_yr));
// days left till the end of that month
$base_day_diff = $base_mon_max - $base_day;
// month left till end of that year
// substract one to handle overflow correctly
$base_mon_diff = 12 - $base_mon - 1;
// start on jan 1st of the next year
$start_day = 1;
$start_mon = 1;
$start_yr = $base_yr + 1;
// difference to that 1st of jan
$day_diff = $current_day - $start_day + 1;
// add today
$mon_diff = $current_mon - $start_mon + 1;
// add current month
$yr_diff = $current_yr - $start_yr;
// and add the rest of $base_yr
$day_diff = $day_diff + $base_day_diff;
$mon_diff = $mon_diff + $base_mon_diff;
// handle overflow of days
if ($day_diff >= $base_mon_max) {
$day_diff = $day_diff - $base_mon_max;
$mon_diff = $mon_diff + 1;
}
// handle overflow of years
if ($mon_diff >= 12) {
$mon_diff = $mon_diff - 12;
$yr_diff = $yr_diff + 1;
}
return array("years" => $yr_diff, "months" => $mon_diff, "days" => $day_diff);
}
