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import pandas as pdjan = pd.date_range(start='2021-01-01', end='2021-01-31')data = { "registered": [5, 4, 3, 4, 3, 5, 1, 6, 1, 9, 5, 3, 7, 2, 8, 4, 4, 6, 4, 3, 2, 5, 3, 4, 2, 6, 8, 5, 3, 4, 5]}df = pd.DataFrame(data, index=jan)print(df.first('5D'))registered 2021-01-01 5 2021-01-02 4 2021-01-03 3 2021-01-04 4 2021-01-05 3