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  * [ Missing values ](../missing_value.html)

  * [ __ ](../../index.html)
  * [ API reference ](../index.html)
  * [ Series ](../series.html)
  * pandas.Serie... 

#  pandas.Series.dt.is_month_start  #

Series.dt.  is_month_start  [ [source]  ](https://github.com/pandas-
dev/pandas/blob/v2.2.2/pandas/core/accessor.py#L95-L96) #

    

Indicates whether the date is the first day of the month.

Returns  :

    

Series or array

    

For Series, returns a Series with boolean values. For DatetimeIndex,