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I am thinking the cell is formated to a date format.
That number 0 is referenced to 1899-12-30, so when changed to dates 0 to 
33 show these numbers. Interestingly, excel uses a simpler date, but last 
time I checked it didn't work with negative numbers, but calc does??

0       1899-12-30
1       1899-12-31
2       1900-01-01
3       1900-01-02
4       1900-01-03
5       1900-01-04
6       1900-01-05
7       1900-01-06
8       1900-01-07
9       1900-01-08
10      1900-01-09
11      1900-01-10
12      1900-01-11
13      1900-01-12
14      1900-01-13
15      1900-01-14
16      1900-01-15
17      1900-01-16
18      1900-01-17
19      1900-01-18
20      1900-01-19
21      1900-01-20
22      1900-01-21
23      1900-01-22
24      1900-01-23
25      1900-01-24
26      1900-01-25
27      1900-01-26
28      1900-01-27
29      1900-01-28
30      1900-01-29
31      1900-01-30
32      1900-01-31
33      1900-02-01

On 2 Oct 2015 at 19:38, Thomas Blasejewicz wrote:

To:                     "" 
From:                   Thomas Blasejewicz <>
Subject:                [libreoffice-users] Calc cell formats
Date sent:              Fri, 2 Oct 2015 19:38:50 +0900

Good evening
I do have (naturally) a number of spread sheets.
One is a list of my patients.
It includes columns with name, sex, age, date of birth etc.

I did create a page style, where I tried to set "numbers" to standard
(because there are NO decimals!)
and "date" to "1999/02/10".

(the file originally was a Lotus123 file, saved in Excel 2003 format,
read with Calc and then saved as ODS)
However, when I apply that style, the "date" which had been
unintelligible 5-digit numbers changes to the
specified format, but at the same time columns with the age of patients
(TWO digits, no calcuations whatsoever)
and consecutive numbers switch to a row of three # =because they are to
narrow to display the "1900/02/10) inserted.
What is this nonsense all about???
Why is the age of a person (e.g. 33) be replaced by a nonsense date?

Also, while I specified the date as given above, opening the very same
file under kubuntu, it suddenly is reverse to 02/10/1999. Why?

AND the style I specified does not seem to be retained.
When I close the file and reopen (in particular if this is on another
computer) it, the settings seem to have vanished.

Thank you.

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