I have an .xlsx file that has some custom date/time formatted columns. Specifically, I have 2 columns that have custom format of yyyy-mm-ddThh:nn:ssZ
When I open it in LibreOffice Calc, the dates in those 2 columns show as decimal numbers instead, eg. 44778.6423148148
If I open the document in Excel Online, everything looks as it should. If I change the format of those 2 columns within Calc using the same format of yyyy-mm-ddThh:nn:ssZ, they change just fine.
I also wanted to add that I am exporting this file from PowerBi so I don't have the option to save it in an older format of excel.
How can I have it retain the formatting when opening the file in Calc?