pub fn date_time_from_fields(
f: CalendarDateTime,
zone: &TzId,
) -> Option<(i64, i32)>Expand description
Same as local_date_time_from_fields, but the wall-clock reading is
in the given zone – for a fixed Offset, subtracts it to get the
UTC instant DateTime actually stores (see its doc comment); for a
Named zone, resolves the real, DST-aware offset for this specific
local date-time via chrono-tz (the same zone can mean a different
offset on a different date, which is why this needs the full
calendar context resolve_offset alone doesn’t have).