QST: errors='coerce' causing pd.to_datetime to row-wise change format guessing arbitrarily?
Hi!

I just stumbled across this problem, where I had a date field with some '--' values which needed to be coerced to NaT. Problem is that while using that, pd.to_datetime ended up using different date formats across the records, exchanging month with date apparently arbitrarily. I think I solved this by declaring the format explicitly, but I'm worried about any other related issues that I may oversee.

Any thoughts? 

Thank you,
Iván.