Converting ddhhmm to YYYY-MM-DD hh:mm format in C++

I have a string which has the time in UTC as ddhhmm and I need to convert it to YYYY-MM-dd hh:mm:ss format.

Example Input: 220805
Output: 2020-06-22 08:05:00

As I know that <chrono> library can handle only time and not dates. I am not getting how to convert between local time and UTC when I do the conversion. Is there any C++ specific library which does this?

Thanks in advance.