Question

I need know if a $paymentDate (31/12/2010) is valid between $contractDateBegin(01/01/2001) and $contractDateEnd(01/01/2012)

dd/mm/yyyy FORMAT !

Answer 1

As of PHP 5.3:

$paymentDate = DateTime::createFromFormat('d/m/Y', '31/12/2010');
$contractDateBegin = DateTime::createFromFormat('d/m/Y', '01/01/2001');
$contractDateEnd = DateTime::createFromFormat('d/m/Y', '01/01/2012');

if ($paymentDate >= $contractDateBegin && $paymentDate <= $contractDateEnd)
{
  echo "is between\n";
}

You may need to adjust the use of <= to < depending on whether or not the dates are exclusive.