At 2 AM on the graph, the pop-up displays 00:00. So, it would appear as though the pop-up is actually two hours behind. However, when I slide over to 4 AM, the pop up displays 00:25. At 6 AM, the pop-up shows 00:49.
It appears to me as if the pop-up is actually calculating about 12 minutes each hour. Is this due to the fact that it is basing calculations on 5 minute polling intervals, when I'm actually polling every minute?Update: My graphs are again showing pop-up times exactly one hour behind the actual time. I know I'm not crazy, and the description above is what I saw a few hours ago, but I just spent the last 10 minutes trying to reproduce it and I cannot.
Statistics: Posted by garrycook — Sat May 26, 2007 2:55 am
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There can be inconsistencies between the timezone libraries used by perl (to obtain timezone offset) and RRDTool (for the graph). Sometime these can be helped by installing the Time::Zone package which is more detailed and supports symbolic timezones. Also, although the code attempts to cancel out the effect of your browser's timezone and clock, this seems to be able to affect things still (may be a browser-specific issue).
It may be that the off-by-one is a DST issue whereby one of the timezone functions is calculating the time correctly, and the other is missing/adding DST. I haven't managed to duplicate it here yet since the initial chaos (New Zealand has a timezone of +12/+13 and the +13 confused things considerably at one point).
Statistics: Posted by stevesh — Fri May 25, 2007 10:31 am
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