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//! A method to obtain the local offset from UTC.

#![allow(clippy::missing_const_for_fn)]

#[cfg_attr(target_family = "windows", path = "windows.rs")]
#[cfg_attr(target_family = "unix", path = "unix.rs")]
#[cfg_attr(
    all(
        target_family = "wasm",
        not(any(target_os = "emscripten", target_os = "wasi")),
        feature = "wasm-bindgen"
    ),
    path = "wasm_js.rs"
)]
mod imp;

use crate::{OffsetDateTime, UtcOffset};

/// Attempt to obtain the system's UTC offset. If the offset cannot be determined, `None` is
/// returned.
pub(crate) fn local_offset_at(datetime: OffsetDateTime) -> Option<UtcOffset> {
    // miri does not support tzset()
    if cfg!(miri) {
        None
    } else {
        imp::local_offset_at(datetime)
    }
}