Error when trying to parse date in format "yyyy. MM. dd.": "invalid formatting code: unsupported or unescaped characters"

[jerbob92]

When trying to parse an XLSX sheet with the date format yyyy. MM. dd., the following error is returned:
invalid formatting code: unsupported or unescaped characters

Here is the sheet I'm trying to read: https://www.mnb.hu/Root/ExchangeRate/arfolyam.xlsx

I'm not really sure if yyyy. MM. dd. is an actual valid date format, but LibreOffice shows the dates fine. Could it be that the . only has special meaning following some formatting characters?

[github-actions]

Stale issue message

[jerbob92]

Well that is one way to keep the issue count low...

[tealeg]

Ack. Sorry about that. I actually should turn that off. I've but had any time to work on this library lately, but it doesn't mean issues should be ignored.

[jerbob92]

@tealeg thanks! I might fix this myself at some point, I have now made my own implementation of XLSXToSlice that has a custom implementation in case the format is yyyy. MM. dd..

[tealeg]

@jerbob92 I'd be happy to review a PR. Sometimes I"m a bit slow, as you see, but I try to get there eventually.