use time::{OffsetDateTime, UtcOffset}; /// The formatting style for a timestamp.#[derive(Debug, Clone, Copy, PartialEq, Eq)]pub enum TimestampFormat {    /// Formats the timestamp as an absolute time, e.g. "2021-12-31 3:00AM".    Absolute,    /// Formats the timestamp as an absolute time.    /// If the message is from today or yesterday the date will be replaced with "Today at x" or "Yesterday at x" respectively.    /// E.g. "Today at 12:00 PM", "Yesterday at 11:00 AM", "2021-12-31 3:00AM".    EnhancedAbsolute,    /// Formats the timestamp as an absolute time, using month name, day of month, year. e.g. "Feb. 24, 2024".    MediumAbsolute,    /// Formats the timestamp as a relative time, e.g. "just now", "1 minute ago", "2 hours ago", "2 months ago".    Relative,} /// Formats a timestamp, which respects the user's date and time preferences/custom format.pub fn format_localized_timestamp(    timestamp: OffsetDateTime,    reference: OffsetDateTime,    timezone: UtcOffset,    format: TimestampFormat,) -> String {    let timestamp_local = timestamp.to_offset(timezone);    let reference_local = reference.to_offset(timezone);    format_local_timestamp(timestamp_local, reference_local, format)} /// Formats a timestamp, which respects the user's date and time preferences/custom format.pub fn format_local_timestamp(    timestamp: OffsetDateTime,    reference: OffsetDateTime,    format: TimestampFormat,) -> String {    match format {        TimestampFormat::Absolute => format_absolute_timestamp(timestamp, reference, false),        TimestampFormat::EnhancedAbsolute => format_absolute_timestamp(timestamp, reference, true),        TimestampFormat::MediumAbsolute => format_absolute_timestamp_medium(timestamp, reference),        TimestampFormat::Relative => format_relative_time(timestamp, reference)            .unwrap_or_else(|| format_relative_date(timestamp, reference)),    }} /// Formats the date component of a timestamppub fn format_date(    timestamp: OffsetDateTime,    reference: OffsetDateTime,    enhanced_formatting: bool,) -> String {    format_absolute_date(timestamp, reference, enhanced_formatting)} /// Formats the time component of a timestamppub fn format_time(timestamp: OffsetDateTime) -> String {    format_absolute_time(timestamp)} /// Formats the date component of a timestamp in medium stylepub fn format_date_medium(    timestamp: OffsetDateTime,    reference: OffsetDateTime,    enhanced_formatting: bool,) -> String {    format_absolute_date_medium(timestamp, reference, enhanced_formatting)} fn format_absolute_date(    timestamp: OffsetDateTime,    reference: OffsetDateTime,    #[allow(unused_variables)] enhanced_date_formatting: bool,) -> String {    #[cfg(target_os = "macos")]    {        if !enhanced_date_formatting {            return macos::format_date(&timestamp);        }         let timestamp_date = timestamp.date();        let reference_date = reference.date();        if timestamp_date == reference_date {            "Today".to_string()        } else if reference_date.previous_day() == Some(timestamp_date) {            "Yesterday".to_string()        } else {            macos::format_date(&timestamp)        }    }    #[cfg(target_os = "windows")]    {        if !enhanced_date_formatting {            return windows::format_date(&timestamp);        }         let timestamp_date = timestamp.date();        let reference_date = reference.date();        if timestamp_date == reference_date {            "Today".to_string()        } else if reference_date.previous_day() == Some(timestamp_date) {            "Yesterday".to_string()        } else {            windows::format_date(&timestamp)        }    }    #[cfg(not(any(target_os = "macos", target_os = "windows")))]    {        // todo(linux) respect user's date/time preferences        let current_locale = CURRENT_LOCALE            .get_or_init(|| sys_locale::get_locale().unwrap_or_else(|| String::from("en-US")));        format_timestamp_naive_date(            timestamp,            reference,            is_12_hour_time_by_locale(current_locale.as_str()),        )    }} fn format_absolute_time(timestamp: OffsetDateTime) -> String {    #[cfg(target_os = "macos")]    {        macos::format_time(&timestamp)    }    #[cfg(target_os = "windows")]    {        windows::format_time(&timestamp)    }    #[cfg(not(any(target_os = "macos", target_os = "windows")))]    {        // todo(linux) respect user's date/time preferences        let current_locale = CURRENT_LOCALE            .get_or_init(|| sys_locale::get_locale().unwrap_or_else(|| String::from("en-US")));        format_timestamp_naive_time(            timestamp,            is_12_hour_time_by_locale(current_locale.as_str()),        )    }} fn format_absolute_timestamp(    timestamp: OffsetDateTime,    reference: OffsetDateTime,    #[allow(unused_variables)] enhanced_date_formatting: bool,) -> String {    #[cfg(any(target_os = "macos", target_os = "windows"))]    {        if !enhanced_date_formatting {            return format!(                "{} {}",                format_absolute_date(timestamp, reference, enhanced_date_formatting),                format_absolute_time(timestamp)            );        }         let timestamp_date = timestamp.date();        let reference_date = reference.date();        if timestamp_date == reference_date {            format!("Today at {}", format_absolute_time(timestamp))        } else if reference_date.previous_day() == Some(timestamp_date) {            format!("Yesterday at {}", format_absolute_time(timestamp))        } else {            format!(                "{} {}",                format_absolute_date(timestamp, reference, enhanced_date_formatting),                format_absolute_time(timestamp)            )        }    }    #[cfg(not(any(target_os = "macos", target_os = "windows")))]    {        // todo(linux) respect user's date/time preferences        format_timestamp_fallback(timestamp, reference)    }} fn format_absolute_date_medium(    timestamp: OffsetDateTime,    reference: OffsetDateTime,    enhanced_formatting: bool,) -> String {    #[cfg(target_os = "macos")]    {        if !enhanced_formatting {            return macos::format_date_medium(&timestamp);        }         let timestamp_date = timestamp.date();        let reference_date = reference.date();        if timestamp_date == reference_date {            "Today".to_string()        } else if reference_date.previous_day() == Some(timestamp_date) {            "Yesterday".to_string()        } else {            macos::format_date_medium(&timestamp)        }    }    #[cfg(target_os = "windows")]    {        if !enhanced_formatting {            return windows::format_date_medium(&timestamp);        }         let timestamp_date = timestamp.date();        let reference_date = reference.date();        if timestamp_date == reference_date {            "Today".to_string()        } else if reference_date.previous_day() == Some(timestamp_date) {            "Yesterday".to_string()        } else {            windows::format_date_medium(&timestamp)        }    }    #[cfg(not(any(target_os = "macos", target_os = "windows")))]    {        // todo(linux) respect user's date/time preferences        let current_locale = CURRENT_LOCALE            .get_or_init(|| sys_locale::get_locale().unwrap_or_else(|| String::from("en-US")));        if !enhanced_formatting {            return format_timestamp_naive_date_medium(                timestamp,                is_12_hour_time_by_locale(current_locale.as_str()),            );        }         let timestamp_date = timestamp.date();        let reference_date = reference.date();        if timestamp_date == reference_date {            "Today".to_string()        } else if reference_date.previous_day() == Some(timestamp_date) {            "Yesterday".to_string()        } else {            format_timestamp_naive_date_medium(                timestamp,                is_12_hour_time_by_locale(current_locale.as_str()),            )        }    }} fn format_absolute_timestamp_medium(    timestamp: OffsetDateTime,    reference: OffsetDateTime,) -> String {    #[cfg(target_os = "macos")]    {        format_absolute_date_medium(timestamp, reference, false)    }    #[cfg(target_os = "windows")]    {        format_absolute_date_medium(timestamp, reference, false)    }    #[cfg(not(any(target_os = "macos", target_os = "windows")))]    {        // todo(linux) respect user's date/time preferences        // todo(windows) respect user's date/time preferences        format_timestamp_fallback(timestamp, reference)    }} fn format_relative_time(timestamp: OffsetDateTime, reference: OffsetDateTime) -> Option<String> {    let difference = reference - timestamp;    let minutes = difference.whole_minutes();    match minutes {        0 => Some("Just now".to_string()),        1 => Some("1 minute ago".to_string()),        2..=59 => Some(format!("{} minutes ago", minutes)),        _ => {            let hours = difference.whole_hours();            match hours {                1 => Some("1 hour ago".to_string()),                2..=23 => Some(format!("{} hours ago", hours)),                _ => None,            }        }    }} fn format_relative_date(timestamp: OffsetDateTime, reference: OffsetDateTime) -> String {    let timestamp_date = timestamp.date();    let reference_date = reference.date();    let difference = reference_date - timestamp_date;    let days = difference.whole_days();    match days {        0 => "Today".to_string(),        1 => "Yesterday".to_string(),        2..=6 => format!("{} days ago", days),        _ => {            let weeks = difference.whole_weeks();            match weeks {                1 => "1 week ago".to_string(),                2..=4 => format!("{} weeks ago", weeks),                _ => {                    let month_diff = calculate_month_difference(timestamp, reference);                    match month_diff {                        0..=1 => "1 month ago".to_string(),                        2..=11 => format!("{} months ago", month_diff),                        months => {                            let years = months / 12;                            match years {                                1 => "1 year ago".to_string(),                                _ => format!("{years} years ago"),                            }                        }                    }                }            }        }    }} /// Calculates the difference in months between two timestamps./// The reference timestamp should always be greater than the timestamp.fn calculate_month_difference(timestamp: OffsetDateTime, reference: OffsetDateTime) -> usize {    let timestamp_year = timestamp.year();    let reference_year = reference.year();    let timestamp_month: u8 = timestamp.month().into();    let reference_month: u8 = reference.month().into();     let month_diff = if reference_month >= timestamp_month {        reference_month as usize - timestamp_month as usize    } else {        12 - timestamp_month as usize + reference_month as usize    };     let year_diff = (reference_year - timestamp_year) as usize;    if year_diff == 0 {        reference_month as usize - timestamp_month as usize    } else if month_diff == 0 {        year_diff * 12    } else if timestamp_month > reference_month {        (year_diff - 1) * 12 + month_diff    } else {        year_diff * 12 + month_diff    }} /// Formats a timestamp, which is either in 12-hour or 24-hour time format./// Note:/// This function does not respect the user's date and time preferences./// This should only be used as a fallback mechanism when the OS time formatting fails.fn format_timestamp_naive_time(timestamp_local: OffsetDateTime, is_12_hour_time: bool) -> String {    let timestamp_local_hour = timestamp_local.hour();    let timestamp_local_minute = timestamp_local.minute();     let (hour, meridiem) = if is_12_hour_time {        let meridiem = if timestamp_local_hour >= 12 {            "PM"        } else {            "AM"        };         let hour_12 = match timestamp_local_hour {            0 => 12,                              // Midnight            13..=23 => timestamp_local_hour - 12, // PM hours            _ => timestamp_local_hour,            // AM hours        };         (hour_12, Some(meridiem))    } else {        (timestamp_local_hour, None)    };     match meridiem {        Some(meridiem) => format!("{}:{:02} {}", hour, timestamp_local_minute, meridiem),        None => format!("{:02}:{:02}", hour, timestamp_local_minute),    }} #[cfg(not(target_os = "macos"))]fn format_timestamp_naive_date(    timestamp_local: OffsetDateTime,    reference_local: OffsetDateTime,    is_12_hour_time: bool,) -> String {    let reference_local_date = reference_local.date();    let timestamp_local_date = timestamp_local.date();     if timestamp_local_date == reference_local_date {        "Today".to_string()    } else if reference_local_date.previous_day() == Some(timestamp_local_date) {        "Yesterday".to_string()    } else {        match is_12_hour_time {            true => format!(                "{:02}/{:02}/{}",                timestamp_local_date.month() as u32,                timestamp_local_date.day(),                timestamp_local_date.year()            ),            false => format!(                "{:02}/{:02}/{}",                timestamp_local_date.day(),                timestamp_local_date.month() as u32,                timestamp_local_date.year()            ),        }    }} #[cfg(not(any(target_os = "macos", target_os = "windows")))]fn format_timestamp_naive_date_medium(    timestamp_local: OffsetDateTime,    is_12_hour_time: bool,) -> String {    let timestamp_local_date = timestamp_local.date();     match is_12_hour_time {        true => format!(            "{:02}/{:02}/{}",            timestamp_local_date.month() as u32,            timestamp_local_date.day(),            timestamp_local_date.year()        ),        false => format!(            "{:02}/{:02}/{}",            timestamp_local_date.day(),            timestamp_local_date.month() as u32,            timestamp_local_date.year()        ),    }} pub fn format_timestamp_naive(    timestamp_local: OffsetDateTime,    reference_local: OffsetDateTime,    is_12_hour_time: bool,) -> String {    let formatted_time = format_timestamp_naive_time(timestamp_local, is_12_hour_time);    let reference_local_date = reference_local.date();    let timestamp_local_date = timestamp_local.date();     if timestamp_local_date == reference_local_date {        format!("Today at {}", formatted_time)    } else if reference_local_date.previous_day() == Some(timestamp_local_date) {        format!("Yesterday at {}", formatted_time)    } else {        let formatted_date = match is_12_hour_time {            true => format!(                "{:02}/{:02}/{}",                timestamp_local_date.month() as u32,                timestamp_local_date.day(),                timestamp_local_date.year()            ),            false => format!(                "{:02}/{:02}/{}",                timestamp_local_date.day(),                timestamp_local_date.month() as u32,                timestamp_local_date.year()            ),        };        format!("{} {}", formatted_date, formatted_time)    }} #[cfg(not(any(target_os = "macos", target_os = "windows")))]static CURRENT_LOCALE: std::sync::OnceLock<String> = std::sync::OnceLock::new(); #[cfg(not(any(target_os = "macos", target_os = "windows")))]fn format_timestamp_fallback(timestamp: OffsetDateTime, reference: OffsetDateTime) -> String {    let current_locale = CURRENT_LOCALE        .get_or_init(|| sys_locale::get_locale().unwrap_or_else(|| String::from("en-US")));     let is_12_hour_time = is_12_hour_time_by_locale(current_locale.as_str());    format_timestamp_naive(timestamp, reference, is_12_hour_time)} /// Returns `true` if the locale is recognized as a 12-hour time locale.#[cfg(not(any(target_os = "macos", target_os = "windows")))]fn is_12_hour_time_by_locale(locale: &str) -> bool {    [        "es-MX", "es-CO", "es-SV", "es-NI",        "es-HN", // Mexico, Colombia, El Salvador, Nicaragua, Honduras        "en-US", "en-CA", "en-AU", "en-NZ", // U.S, Canada, Australia, New Zealand        "ar-SA", "ar-EG", "ar-JO", // Saudi Arabia, Egypt, Jordan        "en-IN", "hi-IN", // India, Hindu        "en-PK", "ur-PK", // Pakistan, Urdu        "en-PH", "fil-PH", // Philippines, Filipino        "bn-BD", "ccp-BD", // Bangladesh, Chakma        "en-IE", "ga-IE", // Ireland, Irish        "en-MY", "ms-MY", // Malaysia, Malay    ]    .contains(&locale)} #[cfg(target_os = "macos")]mod macos {    use core_foundation::base::TCFType;    use core_foundation::date::CFAbsoluteTime;    use core_foundation::string::CFString;    use core_foundation_sys::date_formatter::CFDateFormatterCreateStringWithAbsoluteTime;    use core_foundation_sys::date_formatter::CFDateFormatterRef;    use core_foundation_sys::locale::CFLocaleRef;    use core_foundation_sys::{        base::kCFAllocatorDefault,        date_formatter::{            CFDateFormatterCreate, kCFDateFormatterMediumStyle, kCFDateFormatterNoStyle,            kCFDateFormatterShortStyle,        },        locale::CFLocaleCopyCurrent,    }; 

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