Github API: Code frequency - Lines added and deleted - Identify week


I need help with code frequency statistics.

I verified that I can get this information as shown below:

Returns occurrences in the following format:


The first number is the week identifier, second rows added and third rows deleted.

How do I convert the week identifier to a valid date? example second week of March 2021.
What scale is this number on?

Another question is that I can’t page the code frequency, as shown below:

I need the old weeks. Between 2012 and 2019. How do I get it?