MAC OSx - Office 365 Excel - Date incorrect for any years after 2030

[geoffSJE]

Experiencing dates of XX/XX/30 or above reverting to 1930 to 19XX.

The only way currently is to type a 4 digit year.

How to correct this on a Mac (Any OS Sierra or higher)?

Thanks for any assistance.

:)

[#2]

@geoffSJE Have a look under Excel, Preferences..., Edit.

Change the "30" at the bottom. You can go down to 4. Does this help?

[#3]

@Riny_van_Eekelen 

Thank you, it does work when I increase the number from 30 to 99. 

Yet I don't see a way to save that setting.  Even when I change it and then save the file, the saved file then does not work again, as all dates that were changed originally from changing the edit stay correct, yet any new dates do not work and I have to go back into the 'Edit' and increase it past 30.

Also when I go to a new spreadsheet, it is reverted back to 30 as the setting is not saved.

Curious if it is something in OSx that needs to be changed so it's automatic.

:)

:)