+=item add_freq TIMESTAMP
+
+Adds the frequency of this package to the provided timestamp and returns
+the resulting timestamp, or -1 if the frequency of this package could not be
+parsed (shouldn't happen).
+
+=cut
+
+sub add_freq {
+ my( $self, $date ) = @_;
+ my $freq = $self->freq;
+
+ #change this bit to use Date::Manip? CAREFUL with timezones (see
+ # mailing list archive)
+ my ($sec,$min,$hour,$mday,$mon,$year) = (localtime($date) )[0,1,2,3,4,5];
+
+ if ( $self->freq =~ /^\d+$/ ) {
+ $mon += $self->freq;
+ until ( $mon < 12 ) { $mon -= 12; $year++; }
+ } elsif ( $self->freq =~ /^(\d+)w$/ ) {
+ my $weeks = $1;
+ $mday += $weeks * 7;
+ } elsif ( $self->freq =~ /^(\d+)d$/ ) {
+ my $days = $1;
+ $mday += $days;
+ } elsif ( $self->freq =~ /^(\d+)h$/ ) {
+ my $hours = $1;
+ $hour += $hours;
+ } else {
+ return -1;
+ }
+
+ timelocal_nocheck($sec,$min,$hour,$mday,$mon,$year);
+}
+