code: def epoch_to_dttm(cls) -> str:
      return "(DAYS({col}) - DAYS('1970-01-01')) * 86400 + MIDNIGHT_SECONDS({col})"
  
imports: from .db2 import Db2EngineSpec
label_desc: Use image node_id 1 for calling the IBMiEngineSpec obj's underlying member method code with example usage: obj.epoch_to_dttm(cls) and returns: str