I have an Excel 2010 file like so:
date time connections 2010-10-18 08:20:00 38 2010-10-18 08:20:01 71 2010-10-18 08:20:02 67
I want a line graph with the number of connections as the y axis and the second as the x axis.
Change the format of your data to something like
It seems that if the data has the date in it, that gets used as the X-axis scale rather than the time.
It appears from your column title that you have the date and time in separate columns. To graph the connections per second over more than one day you will need to merge the date and time into a single datetime value. The simplest way to do that is simply add the the date and time together in another column (assuming your date and time data is correctly formatted and Excel is interpreting them as such).