code: def convert(self, value, param, ctx):
      try:
          return self.parser(value)
      except ValueError:
          self.fail(
              "%s is not a valid %s" % (value, self.name.lower()),
              param,
              ctx,
          )
  
imports: from itertools import count
  import click
  import pandas
  from .context_tricks import CallbackManager
label_desc: Use image node_id 4 for calling the _DatetimeParam obj's underlying member method code with example usage: obj.convert(value, param, ctx) and returns: self