text: import json
  import croniter
  from datetime import datetime
  
  
  def pretty_json(j_str: str):
      j_data = json.loads(j_str)
      return json.dumps(j_data, indent=2, sort_keys=True)
  
  
  def get_next_cron(cron_expression: str):
      cron = croniter.croniter(cron_expression, datetime.strptime('2020-12-19 19:39:42', '%Y-%m-%d %H:%M:%S'))
      return cron.get_next(datetime)
  
  
  print(get_next_cron('*/15 * * * *'))
  print(datetime.strptime('2020-12-19 19:39:42', '%Y-%m-%d %H:%M:%S'))
  