code: def get_current_datetime_str():
      return datetime.now().strftime("%Y-%m-%d-%H-%M")
  
imports: from fate.ml.nn.model_zoo.agg_layer.agg_layer import AggLayerGuest, AggLayerHost
  import sys
  from datetime import datetime
label_desc: Use image node_id 1 for calling a global function with example usage: get_current_datetime_str() and returns: datetime