code: def datetime(x):
      return np.array(x, dtype=np.datetime64)
  
imports: import numpy
  from bokeh.models import ColumnDataSource, CustomJSTransform
  from bokeh.plotting import figure, show
  from bokeh.sampledata.stocks import AAPL, GOOG
  from bokeh.transform import transform
label_desc: Use image node_id 1 for calling a global function with example usage: datetime(x) and returns: np