--- /dev/null
+
+#!/usr/bin/perl -w
+#run nightly -- changes J to A on someone's 18th birthday
+use lib '/usr/local/koha/intranet/modules/';
+use strict;
+use C4::Context;
+my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)
+ = localtime(time);
+$year +=1900;
+$mon +=1; if ($mon < 10) {$mon = "0".$mon;}
+if ($mday < 10) {$mday = "0".$mday;}
+
+$year -=18; #18 year olds here: if your J turns to A before this change here
+my $dbh=C4::Context->dbh;
+
+#get today's date, format it and subtract 18 yrs.
+my $itsyourbirthday = "$year-$mon-$mday";
+
+my $fixit="UPDATE borrowers SET categorycode='A' WHERE dateofbirth<=? AND dateofbirth!='0000-00-00' AND categorycode='J'";
+
+my $sth=$dbh->prepare($fixit);
+my $res = $sth->execute($itsyourbirthday) or die "can't execute";
+print "$res\n"; #did it work?
+$dbh->disconnect();