It is most likely the formatting of the cells.

Open the Format Cells dialog.
(select the cell range containing the date / time values and hit Ctrl+1, or right-click and select Format Cells)

Go to the Numbers tab and select the desired format.

The Format Code you want is probably:   MM/DD/YY HH:MM:SS AM/PM


On 10/9/25 11:52, Patrick Dupre wrote:
Hello,


I have an ascii file with
Date Time       MeaValue
10/4/25 11:27:04 PM     43.9
10/4/25 11:27:05 PM     34.7
10/4/25 11:27:06 PM     45.4
10/4/25 11:27:07 PM     34.7
10/4/25 11:27:08 PM     34.2

that I open with calc
The 1st window is OK
correctly showing the 2 columns

Date Time       MeaValue
10/4/25 11:27:04 PM     43.9
10/4/25 11:27:05 PM     34.7
10/4/25 11:27:06 PM     45.4
10/4/25 11:27:07 PM     34.7
10/4/25 11:27:08 PM     34.2

but in calc I get
Date Time       MeaValue
10/04/25 11:27 PM       43.9
10/04/25 11:27 PM       34.7
10/04/25 11:27 PM       45.4
10/04/25 11:27 PM       34.7

It means that the 1 second resolution is missing.

How can I recover it?

Thank.

===========================================================================
  Patrick DUPRÉ                                 | | email: [email protected]
===========================================================================



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