-module(glrss_parser_ffi).

-export([current_year/0, offset_to_utc/2]).

-spec current_year() -> non_neg_integer().
current_year() ->
    {{Year, _, _}, _} = calendar:local_time(),
    Year.

-spec offset_to_utc(calendar:datetime(), integer()) -> calendar:datetime().
offset_to_utc(DateTime, OffsetMinutes) ->
    OffsetSeconds = OffsetMinutes * 60,
    Seconds = calendar:datetime_to_gregorian_seconds(DateTime),
    UtcSeconds = Seconds - OffsetSeconds,
    UtcTime = calendar:gregorian_seconds_to_datetime(UtcSeconds),
    UtcTime.