rrdfirst - Return the date of the first data sample in an RRA within an RRD
rrdtool first filename [--rraindex number]
The first function returns the UNIX timestamp of the first data sample entered into the specified RRA of the RRD file.
The name of the RRD that contains the data.
The index number of the RRA that is to be examined. If not specified, the index defaults to zero. RRA index numbers can be determined through rrdtool info.
Burton Strauss <Burton@ntopSupport.com>