def list_UTCs_until(utc):
    check = Observation(utc)
    start_utc = get_first_UTC()
    UTCs_from_start = list_UTCs_from(start_utc)
    end_utc = utc
    index = N.where((UTCs_from_start == end_utc))[0]
    UTCs_until = UTCs_from_start[:(index + 1)]
    return UTCs_until
def list_UTCs_until(utc):
    check = Observation(utc)
    start_utc = get_first_UTC()
    UTCs_from_start = list_UTCs_from(start_utc)
    end_utc = utc
    index = N.where((UTCs_from_start == end_utc))[0]
    UTCs_until = UTCs_from_start[:(index + 1)]
    return UTCs_until