Date Combine/Concatenate

Hi,

I have a column of dates that are in the format e.g. 202003 as March 2020 etc that are either whole number or text.

Power BI doesnt seem to recognise these dates when I convert and changes it to 21/01/2453.

What I'm thinking is if I added 1 or 01 to the end of each date would it read it as a date okay, so 20200301 for the first of the month?

If so, how can I combine the date with 01 at the end using M and a custom column?

Thanks in advance for any help

Liam