df.head()
period_beginobject
period_endobject

123

2012-01-01

2012-01-31

315

2012-02-01

2012-02-29

871

2012-03-01

2012-03-31

1078

2012-04-01

2012-04-30

1391

2012-05-01

2012-05-31

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