///pub mod tz {    mod error {        use std::fmt;         /// The error returned by [`current_utc_offset()`][super::current_utc_offset()]        #[derive(Debug, Clone, Copy, PartialEq, Eq)]        pub struct Error;         impl fmt::Display for Error {            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {                f.write_str("The system's UTC offset could not be determined")            }        }         impl std::error::Error for Error {}    }    pub use error::Error;     /// The UTC offset in seconds    pub type UTCOffsetInSeconds = i32;     /// Return time offset in seconds from UTC based on the current timezone.    ///    /// Note that there may be various legitimate reasons for failure, which should be accounted for.    pub fn current_utc_offset() -> Result<UTCOffsetInSeconds, Error> {        // TODO: make this work without cfg(unsound_local_offset), see        //       https://github.com/time-rs/time/issues/293#issuecomment-909158529        // TODO: get a function to return the current time as well to avoid double-lookups        //       (to get the offset, the current time is needed)        time::UtcOffset::current_local_offset()            .map(|ofs| ofs.whole_seconds())            .map_err(|_| Error)    }}