code: def dt_start(data: pd.DataFrame) -> Any:
      """
      Args:
          data (pd.DataFrame): Time series.
  
      Returns:
          datetime: Start datetime.
      """
      return data.index.min().to_pydatetime()
  
file_path: tslumen/tslumen/profile/summary.py
imports: from typing import Any, Optional
  import numpy
  import pandas
  from statsmodels.tsa.tsatools import freq_to_period
  from tslumen.profile.base import ProfilingFunction, TypeSeriesFrame
label_desc: Use image node_id 3 for calling a global function with example usage: dt_start(data) and returns: data