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I want to obtain the sum of several cells containing a period of time in the format HH:MM:SS. In LibreOffice Calc 4.0.3.3, I've copy-pasted the periods of time in the range G14:G21, and formatted the cells as Time HH:MM:SS. I formatted in the same way the cell G22, and inserted in it the following SUM function:

=SUM(G14:G21)

Instead of the expected result, the function returns me this solution 00:00:00. Could you explain me where am I wrong?

Gianluca
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3 Answers3

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You have the wrong format. HH wraps around every 24 hours. Try using [HH] instead of HH, then you get the total number of hours.

hansfbaier
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The problem was on the way the data were inserted. Even if cells were formatted as Date, analysing them more in detail I found the values were preceded by an ' (apostrophe). Thus means LibreOffice were seeing them as text string and not a period of time. Deleting the apostrophe solved the issue.

Gianluca
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0

Is a special function required to sum a range of hours and minutes? I'm using 6.2.0.3 on macOS and SUM doesn't calculate the value correctly. Oddly, however, if I select all of the cells in the range then the correct value is displayed in the footer bar does. But, for example, SUM(G1:G15) doesn't show the correct value.

Matt Setter
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