investigate the DatePeriod php's native object for recurring invoices

[JoeZ99]

from the docs:

public DatePeriod::__construct ( DateTime $start , DateInterval $interval , int $recurrences [, int $options ] )
public DatePeriod::__construct ( DateTime $start , DateInterval $interval , DateTime $end [, int $options ] )
public DatePeriod::__construct ( string $isostr [, int $options ] )

it looks it can come quite handy for the recurring invoice.
@Gissues:{"order":50,"status":"inprogress"}