The agent records statistics for each day, updating the project stats after each connection with the project, till a new day starts on your node. In this case, the calendar date or time of the machine was changed long enough to record whole/part of one day also on the next day, then the calendar/time was corrected again.

Default the last 30 days are maintained. A cc_config setting can change this. Got mine on 90 days. Times are recorded as seconds since 1.1.1970, so when you go into statistics_www.worldcommunitygrid.org.xml you could mess with the last few data points, for instance remove the 2nd and 3rd last so the 22nd eod connects directly with the last of the 23rd.

For sure the agent shows the data point connections chronological. When editing, stop the agent first.