parameters: (str)
return_statement: return date_to_timestamp(date)
docstring: convert a string to a posix timestamp
      the string must be in the YYYYMMDDTHHMMSS format
      like 20170534T124500
docstring_summary: convert a string to a posix timestamp
      the string must be in the YYYYMMDDTHHMMSS format
      like 20170534T124500
docstring_tokens: convert a string to a posix timestamp the string must be in the YYYYMMDDTHHMMSS format like 20170534T124500
function: def str_to_time_stamp(str):
      """
      convert a string to a posix timestamp
      the string must be in the YYYYMMDDTHHMMSS format
      like 20170534T124500
      """
      date = datetime.strptime(str, DATETIME_FORMAT)
  
      return date_to_timestamp(date)
function_tokens: def str_to_time_stamp ( str ) : date = datetime . strptime ( str , DATETIME_FORMAT ) return date_to_timestamp ( date )