Value X in chart series place by Datetime?

How I Can place X values in chart date series by DATETIME field ? I can place by Date, Numeric or String, not Datetime. I need days reports - 1 day and 30-50 dates, in table I have fiels TimeStamp (~Datetime) and i need place dates by field type = Datetime. How I Can do it?
Now I create temporary table, change datetime to float and place by numeric.... but it take importatnt time.......
Andrzej DÄ…browski

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