def formatTime(t):
    """
    Formats time into the format yyyy/mm/dd.
    
    Args:
        t (tuple): the original date
        
    Returns:
        string: yyyy/mm/dd
        
    Examples:
        1990/1/1 --> 1990/01/01
    
    """
    if t[1] < 10:
        if t[2] < 10:
            return '{0}/0{1}/0{2}'.format(t[0], t[1], t[2])
        else:
            return '{0}/0{1}/{2}'.format(t[0], t[1], t[2])
    else:
        return '{0}/{1}/{2}'.format(t[0], t[1], t[2])