code: def time_floor(self, tz):
      self.ts.floor("5min")
  
imports: from datetime import datetime
  import numpy
  import pytz
  from pandas import Timestamp
  from .tslib import _tzs
label_desc: Use image node_id 9 for calling the TimestampOps obj's underlying member method code with example usage: obj.time_floor(tz) without return types