Function ion_c_sys::ion_timestamp_get_thru_month

pub unsafe extern "C" fn ion_timestamp_get_thru_month(
    ptime: *mut ION_TIMESTAMP, 
    p_year: *mut c_int, 
    p_month: *mut c_int
) -> iERR

Get year, month If precision is not up to month, 0 will be returned as month value.