Scenario:
1. Open excel file from file and add DateTime to A1.
2. Call Save() for 50 times.
3. Open file in Excel. I see double instead of datetime.
Each call to Save() adds next entry to <x:numFmts>, <x:fonts>, <x:fills> in stylex.xml
Entries in x:numFmts have numFmtId from 0 to 49 and each one has empty formatCode. This overrides built-in cell formats and causes behavior described above.
1. Open excel file from file and add DateTime to A1.
2. Call Save() for 50 times.
3. Open file in Excel. I see double instead of datetime.
Each call to Save() adds next entry to <x:numFmts>, <x:fonts>, <x:fills> in stylex.xml
Entries in x:numFmts have numFmtId from 0 to 49 and each one has empty formatCode. This overrides built-in cell formats and causes behavior described above.
