code: def test_hist(self):
      mpl.rcParams["date.converter"] = "concise"
  
      start_date = datetime.datetime(2023, 10, 1)
      time_delta = datetime.timedelta(days=1)
  
      values1 = np.random.randint(1, 10, 30)
      values2 = np.random.randint(1, 10, 30)
      values3 = np.random.randint(1, 10, 30)
  
      bin_edges = [start_date + i * time_delta for i in range(31)]
  
      fig, (ax1, ax2, ax3) = plt.subplots(3, 1, constrained_layout=True)
      ax1.hist(
          [start_date + i * time_delta for i in range(30)],
          bins=10,
          weights=values1,
      )
      ax2.hist(
          [start_date + i * time_delta for i in range(30)],
          bins=10,
          weights=values2,
      )
      ax3.hist(
          [start_date + i * time_delta for i in range(30)],
          bins=10,
          weights=values3,
      )
  
      fig, (ax4, ax5, ax6) = plt.subplots(3, 1, constrained_layout=True)
      ax4.hist(
          [start_date + i * time_delta for i in range(30)],
          bins=bin_edges,
          weights=values1,
      )
      ax5.hist(
          [start_date + i * time_delta for i in range(30)],
          bins=bin_edges,
          weights=values2,
      )
      ax6.hist(
          [start_date + i * time_delta for i in range(30)],
          bins=bin_edges,
          weights=values3,
      )
  
imports: import datetime
  import numpy
  import pytest
  import matplotlib.pyplot
  import matplotlib
label_desc: Use image node_id 24 for calling the TestDatetimePlotting obj's underlying member method code with example usage: obj.test_hist() without return types