[Libreoffice-bugs] [Bug 136050] New: Calc changes the cell type from time to date when the format-code is changed

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=136050

            Bug ID: 136050
           Summary: Calc changes the cell type from time to date when the
                    format-code is changed
           Product: LibreOffice
           Version: 6.4.4.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: minor
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: bugs_documentfoundation_org.5.kuru at xoxy.net

Description:
I have a calc table where collect data about driving my car. The collected data
is collected as follwing:
  km from: The odometer when I leave the start point (accurate to a 10th of a
kilometer - only used for a different bug)
    km to: The odometer when I arrive the end point (accurate to a 10th of a
kilometer - only used for a different bug)
time from: The clock when I leave the start point (accurate on the minute)
  time to: The clock when I arrive the end point (accurate on the minute)

When I auto calc the time driven (eg. "=D2-C2") the results show up as
[HH]:MM:SS by default. When I change how the time is displayed with the
format-code, the cell type is changed from time to date and the result is
incorrect.

Example:
time from: 17:54
  time to: 18:13

The calculation results in:
* [HH]:MM:SS = 00:19:00 (default)
* [HH]:MM = 00:19
* HH:MM = 00:19
* MM:SS = 19:00
* MM = 12

The default [HH]:MM:SS as well as [HH]:MM, HH:MM and MM:SS work fine. When the
format-code is changed to "MM" the displayed result is incorrect.
This can be fixed with "[MM" or "[MM]", but I would expect "MM" to work as
well. I know that "MM" is used in the date-type cells to display the month, so
from the code-logic point of view, it makes sence that that "MM" must represent
a month. However, since HH:MM and MM:SS work fine, it does not make a whole lot
of sence seen from a human-logic point of view.

For this I have no idea how I would fix this - or what I would expect the
program to do. Maybe CALC could add square brackets by default when you edit
the cell as time-time and only if you switch to the date type by hand you can
get rid of them.

Steps to Reproduce:
1. Enter a time like 00:19:00
2. Change the cell format-code from "[HH]:MM:SS" to "MM"

Actual Results:
The result is displayed as month "12"

Expected Results:
The result should display only the mintes "19"


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.4.4.2 (x64)
Build-ID: 3d775be2011f3886db32dfd395a6a6d1ca2630ff
CPU-Threads: 6; BS: Windows 6.1 Service Pack 1 Build 7601; UI-Render: Standard;
VCL: win; 
Gebietsschema: de-AT (de_AT); UI-Sprache: de-DE
Calc: CL

----

I know that I should use the latest version of LO for this, but right now, I'm
short on time. I test this with the lastest version of the 7.x branch once I
had time to deal with it. However, I expect the results to be the same.

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