oetiker/rrdtool-1.x — pull request #375 by jyavenard (2013-03-30 01:02:01+00:00)
Title: Add --utc to graph option.

Allow to generate a graph as if the current timezone was UTC (e.g set TZ=UTC).
This allow to easily calculate daily average ranging from midgnight to midnight rather that say the last 24 hours.