Different SLA: Setting Due in scrip based on Starts

RT Users
1

Hello

I want to set a different SLA if user filled the field Start, bellow is my
code, but doesn´t work.

my $now = RT::Date->new($RT::SystemUser);
my $sla = RT::Date->new($RT::SystemUser);
$now->SetToNow;
$sla->SetToNow;
$sla->AddSeconds(+14400);

if ( $self->TicketObj->Starts eq ‘1970-01-01 00:00:00’ ) {
$self->TicketObj->SetStarts( $now->ISO );
}
else {
$sla = $self->TicketObj->Starts;
$sla->AddSeconds(+14400);
}

if ( $self->TicketObj->Started eq ‘1970-01-01 00:00:00’ ) {
$self->TicketObj->SetStarted( $now->ISO );
}
if ( $self->TicketObj->Due eq ‘1970-01-01 00:00:00’ ) {
$self->TicketObj->SetDue( $sla->ISO );
}
return 1;

Sds

Cristiano