def get_patient_timestamp_entries(patient):
    """ Get timestamp information from patient database

    This function indexes the patient database dictionary and pulls each
    timestamp for each heart rate entry. The entries are then saved in the
    "all_timestampes" variable.

    :param patient: A dictionary containing all of a patient's information

    :returns: a list of all of the indicated patient's heart rate entry
    timestamps
    """
    all_timestamps = patient["timestamp"]
    return all_timestamps