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== How does Cumulus handle Daylight Saving Time? == | == How does Cumulus handle Daylight Saving Time? == | ||
As far as the timestamps in the extreme logs, monthly log, and the graphs, are concerned; Cumulus doesn't do anything in particular for DST. It generates timestamps based on the Windows clock. So basically, at the start of DST (i.e. when the clocks 'go forward') you will get an apparent gap of one hour in your data, and similarly at the end of DST (i.e. when the clocks 'go back') you will get an apparent hour of duplicate timestamps in your logs and graphs. You will tend to get better results if you leave Cumulus running during the clock change, because if is stopped you may lose data, the exact timing of the affected hours depends on the type of station and when Cumulus was running. | As far as the timestamps in the extreme logs, monthly log, and the graphs, are concerned; Cumulus doesn't do anything in particular for DST. It generates timestamps based on the Windows clock. So basically, at the start of DST (i.e. when the clocks 'go forward') you will get an apparent gap of one hour in your data, and similarly at the end of DST (i.e. when the clocks 'go back') you will get an apparent hour of duplicate timestamps in your logs and graphs. You will tend to get better results if you leave Cumulus running during the clock change, because if it is stopped you may lose data, the exact timing of the affected hours depends on the type of station and when Cumulus was running. | ||
Note that there seems to be an issue with Davis stations, either in the console/logger, or in the Davis DLL which Cumulus uses. If you don't have Cumulus running when DST ends, then when you start Cumulus up again, it doesn't receive all of the logger data it needs to catch up to the present time - the previous hour or so is missing. So with Davis stations, I strongly recommend that you leave Cumulus running at the end of DST, if at all possible. | Note that there seems to be an issue with Davis stations, either in the console/logger, or in the Davis DLL which Cumulus uses. If you don't have Cumulus running when DST ends, then when you start Cumulus up again, it doesn't receive all of the logger data it needs to catch up to the present time - the previous hour or so is missing. So with Davis stations, I strongly recommend that you leave Cumulus running at the end of DST, if at all possible. | ||