code: def time_frame_datetime_formatting_default_explicit_date_only(
      self, nobs
  ):
      self.data["dt"].dt.strftime(date_format="%Y-%m-%d")
  
imports: import numpy
  import pandas
  from pandas import offsets
label_desc: Use image node_id 8 for calling the DatetimeStrftime obj's underlying member method code with example usage: obj.time_frame_datetime_formatting_default_explicit_date_only(nobs) without return types