during a request to the githubAPI, it returns commits not considering time zones but considers them on UI (see the picture below)  A query to get all the January commits [https://api.github.com/repos/LyashenkoGS/analytics4github/commits?since=2017-01-01T00:00:00Z&until=2017-01-31T00:00:00Z](https://api.github.com/repos/LyashenkoGS/analytics4github/commits?since=2017-01-01T00:00:00Z&until=2017-01-31T00:00:00Zl) also the analytics4github displays wrong commits dates 
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