=head1 NAME
rrdlast - Return the date of the last data sample in an RRD
=for html
=head1 SYNOPSIS
B B I
=head1 DESCRIPTION
The B function returns the UNIX timestamp when the RRD was last
updated.
=over 8
=item I
The name of the B that contains the data.
=back
=head1 AUTHOR
Russ Wright