import time


def DDHHMMSS_format(seconds):
    """Convert seconds into  #days:HH:MM:SS format.

    Args:
        seconds(int):  number of seconds to convert

    Returns:  str in the format of DD:HH:MM:SS

    """
    seconds = int(seconds)
    if seconds < 86400:
        return time.strftime("%H:%M:%S", time.gmtime(seconds))
    num_days = seconds / 86400
    return "{} {} {}".format(
        num_days, 'Day' if num_days == 1 else 'Days', time.strftime(
            "%H:%M:%S", time.gmtime(seconds % 86400)))