Selecting a portion of a graph doesn't deal well with timezones

[maplebed]

When I select a portion of a graph to zoom in on that time slice, the time displayed is off by 8 hours. Conveniently, my ganglia server is running in UTC and I am in the Pacific time zone at UTC-8.

Example: http://screencast.com/t/UJOM9eEgWj - I select from just before noon to just after 1pm (13:00) and the resulting graph displays from just before 20:00 to just after 21:00. I'm not sure what the data it's showing is actually representing; this doesn't only work >12hrs before now(). I'm not sure if the displayed time is incorrect or if it's the data that's incorrect.

You can recreate this for yourself at http://ganglia.wikimedia.org/latest/?c=Swift%20pmtpa&m=load_one&r=hour&s=by%20name&hc=4&mc=2. We are running v2.2.0 of the web interface.

[vvuksan]

We are aware of the issue. Working on troubleshooting it.

[alexdean]

This solves the issue for me: eabea48

I don't understand the reasoning behind the previous algorithm, so I'm afraid I'm missing something. I tested w/ varying browser & server time offsets from UTC and this code was correct in the cases I thought of.