Moin! Sowas? ~~~ PHP <?php #Test: echo firstDayOfMounthAgo(1, '2016-01-11'), "\n"; echo firstDayOfMounthAgo(1), "\n"; echo firstDayOfMounthAgo(1, '2016-02-13'), "\n"; echo firstDayOfMounthAgo(1, '1970-02-13'), "\n"; function firstDayOfMounthAgo ($mounth, $date=false) { if (false === $date) $date=date('Y-m-d'); list($Y, $M, $dummy) = explode('-', $date, 3); if ($M <= $mounth) $Y--; return ("$Y-$mounth-1"); } ~~~ Ergebnisse: ~~~ 2015-1-1 2015-1-1 2016-1-1 1970-1-1 ~~~ Weitere Umformungen kannst Du selbst ... Jörg Reinholz

Moin! Sowas? ~~~ PHP <?php echo firstDayOfMounthAgo(1, '2016-01-11'); function firstDayOfMounthAgo ($mounth, $date=false) { if (false===$date) $date=date('Y-m-d'); list($Y, $M, $dummy) = explode('-', $date, 3); if ($M <= $mounth) $Y--; return ("$Y-$mounth-01"); } ~~~ Jörg Reinholz