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Perhaps you can put a sampling of your data into this spreadsheet to illustrate your question. I cannot create a similar effect on the line chart because a line chart cannot work divisions smaller than 1 day. I have specifically formatted the x axis of the scatter chart so that the major division axis labels will show different times of day. I don't know if it will help, but this is a copy of a spreadsheet with random data that I created to illustrate for someone else the diifference between scatter and line and how they treat date/time serials.
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What format is your date/time data? Are they text strings? Date/time serials? Other? This is where not having an example of your data will make it really difficult to debug your solution.
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