Excel won’t recognise text string as a date

I’m trying to import a great many dates from an external source which contains the date field as text in the format:-

Sep 23, 2021

Sep 22, 2021

etc.
Unfortunately, Excel does not recognise it as dates.
I’ve tried splitting it into 3 separate columns and then using DATE(Y,M,D) to assign the year month and date columns, but it fails as I think it won’t recognise ‘Sep’ as a month.
What can I do?