def generate_timestamp_format(date_mapper: dict) -> str:
    """
    Description
    -----------
    Generates a the time format for day,month,year dates based on each's
    specified time_format.

    Parameters
    ----------
    date_mapper: dict
        a dictionary for the schema mapping (JSON) for the dataframe filtered
        for "date_type" equal to Day, Month, or Year.

    Output
    ------
    e.g. "%m/%d/%Y"
    """

    day = "%d"
    month = "%m"
    year = "%y"

    for kk, vv in date_mapper.items():
        if vv["date_type"] == "day":
            day = vv["time_format"]
        elif vv["date_type"] == "month":
            month = vv["time_format"]
        elif vv["date_type"] == "year":
            year = vv["time_format"]

    return str.format("{}/{}/{}", month, day, year)