Gitstats commit_begin does not work

I am using gitstats on windows I am trying to get stats for the current month
however gitstats still returns stats from untill the time the project was created
I am executing this command:

git log --since "1 month ago"

This gives me a month old commits until date, I copy the first commit_id and then executing

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    My issue looks similar to this but I have tried that too
    How can I get the total lines committed today in git?

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