Select data column and click the Sampling Interval mini toolbar button or choose Column: Set Sampling Interval… menu to define Date/Time based sampling interval. (Only Numeric was supported before Origin 2025)

For column with sampling interval, icon shows at the corner.

• Double click to read sampling interval info.

• Select the column and choose Column: Show X Column to display the Sampling interval column to the left of the data

Note: When plotting a column with sampling interval, it will use the inclusive sampling interval for the column instead of any X column to its left.