def _explode_membership_date(transcript_group):
    """Splits the membership date into year, month and day

    Args:
        transcript_group (pandas.DataFrame): The transcript dataset

    Returns:
        pandas.DataFrame: The modified transcript with the membership date exploded
    """

    transcript_group["membership_year"] = transcript_group.became_member_on.dt.year
    transcript_group["membership_month"] = transcript_group.became_member_on.dt.month
    transcript_group["membership_day"] = transcript_group.became_member_on.dt.day

    transcript_group = transcript_group.drop(columns=["became_member_on"])

    return transcript_group