Thanks for the responses. I'm being given an already filled-out .xlsx, but I'm not seeing a difference if I save it to .ods.
The cells are identified as in H:MM format, but the actual measurements are in minutes and seconds (with a few H:MM:SS sprinkled in). It's a bit confusing because what I see in the Cell is "1:18" as in one minute and eighteen seconds, but what I see in the input line is "01:18:00 AM". The hours and minutes makes sense, but what is that "AM" doing there? If I switch to text format, I get decimal numbers (e.g. 0.0541666666666667 in the "1:18" cell). Completely not understanding, I was doing some text manipulation (copy to notepad, add "00:" to the front end, copy back) to try to get the values recognized as minutes and seconds, and that appears to have caused the screw-up. I suppose pursuing why those cells add like time (seconds roll over to minutes at 60, etc.) when they only look like time values, but don't sum() at all should be left for another day. If I ignore the entries with hours (which I suspect are erroneous anyway) and simply divide the original cells by 60, and set the formatting to [H]:MM:SS, I appear to be getting what I need and sum() works as I would expect. Sorry for the confusion. -- View this message in context: http://nabble.documentfoundation.org/Can-t-Sum-time-measurements-tp3999947p4000013.html Sent from the Users mailing list archive at Nabble.com. -- For unsubscribe instructions e-mail to: users+h...@global.libreoffice.org Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/global/users/ All messages sent to this list will be publicly archived and cannot be deleted