Apache OpenOffice (AOO) Bugzilla – Issue 126592
User-defined cell format [S],00 changed in [S],00, after reload
Last modified: 2015-10-19 18:30:52 UTC
If time format is set to [s],00 (seconds + two decimal places), after reopening of the file, the format is everytime changed to [s],00, (extra decimal point on the end).
Seems an old bug, I reproduce with OOo 3.3
And it seems to concatenate. [S],00,…, opened as [S],00,…,, So e.g. if someone work on the same file multiple days (open the file, add/edit something, and save&close the file every day), it can expand into long sequence of commas.