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In our Spreadsheet, when a user selects a range of cells containing date values (as shown in the screenshot Chart data.png) and inserts a chart, the resulting chart displays only the explicit data points from the selected range. This is illustrated in Chart actual.png.
Image
Image

However, in Microsoft Excel, charts based on date values include interpolation between data points. This results in a smoother and more continuous representation of the data over time, as seen in Chart expected.png.
Image

We need to enhance our charting behavior in the Spreadsheet to match Excel’s approach by supporting interpolation for date-based data series. This will ensure a more intuitive and analytical visualization experience for users dealing with time-series data.

Expected Outcome:
Charts in our Spreadsheet should automatically interpolate values for date-based data series, enabling smoother curves or lines, consistent with Excel's charting behavior.