=head1 NAME
rrdfirst - Return the date of the first data sample in an RRA within an RRD
=for html
=head1 SYNOPSIS
B B I [I<--rraindex number>]
=head1 DESCRIPTION
The B function returns the UNIX timestamp of the first data sample for
the specified RRA of the RRD file.
=over 8
=item I
The name of the B that contains the data.
=item I<--rraindex number>
The index number of the B that is to be examined. If not specified, the
index defaults to zero. B index numbers can be determined through
B.
=back
=head1 AUTHOR
Burton Strauss