nitroglycerin 0.4.5

High level dynamodb crate
Documentation 
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use std::time::SystemTime;

use chrono::{DateTime, FixedOffset, Local, Utc};
use rusoto_dynamodb::AttributeValue;

use super::{FromAttributeValue, IntoAttributeValue};
use crate::AttributeError;

/// Convert to/from [`AttributeValue`] as seconds
pub mod seconds {
    use chrono::{DateTime, TimeZone, Utc};
    use rusoto_dynamodb::AttributeValue;

    use crate::{
        convert::{FromAttributeValue, IntoAttributeValue},
        AttributeError,
    };

    /// Convert [`AttributeValue`] as seconds to [`DateTime<Utc>`]
    pub fn try_from_av(av: AttributeValue) -> Result<DateTime<Utc>, AttributeError> {
        let n = i64::try_from_av(av)?;
        Ok(Utc.timestamp(n, 0))
    }

    /// Convert [`DateTime<Utc>`] to [`AttributeValue`] as seconds
    pub fn into_av(dt: DateTime<Utc>) -> AttributeValue {
        dt.timestamp().into_av()
    }
}

impl FromAttributeValue for DateTime<Utc> {
    fn try_from_av(av: AttributeValue) -> Result<Self, AttributeError> {
        let s = String::try_from_av(av)?;
        DateTime::parse_from_rfc3339(&s).map(|dt| dt.with_timezone(&Utc)).map_err(|e| AttributeError::ParseError(Box::new(e)))
    }
}

impl IntoAttributeValue for DateTime<Utc> {
    fn into_av(self) -> AttributeValue {
        self.to_rfc3339().into_av()
    }
}

impl FromAttributeValue for DateTime<Local> {
    fn try_from_av(av: AttributeValue) -> Result<Self, AttributeError> {
        let s = String::try_from_av(av)?;
        DateTime::parse_from_rfc3339(&s).map(|dt| dt.with_timezone(&Local)).map_err(|e| AttributeError::ParseError(Box::new(e)))
    }
}

impl IntoAttributeValue for DateTime<Local> {
    fn into_av(self) -> AttributeValue {
        self.to_rfc3339().into_av()
    }
}

impl FromAttributeValue for DateTime<FixedOffset> {
    fn try_from_av(av: AttributeValue) -> Result<Self, AttributeError> {
        let s = String::try_from_av(av)?;
        DateTime::parse_from_rfc3339(&s).map_err(|e| AttributeError::ParseError(Box::new(e)))
    }
}

impl IntoAttributeValue for DateTime<FixedOffset> {
    fn into_av(self) -> AttributeValue {
        self.to_rfc3339().into_av()
    }
}

impl FromAttributeValue for SystemTime {
    fn try_from_av(av: AttributeValue) -> Result<Self, AttributeError> {
        let s = String::try_from_av(av)?;
        DateTime::parse_from_rfc3339(&s).map(SystemTime::from).map_err(|e| AttributeError::ParseError(Box::new(e)))
    }
}

impl IntoAttributeValue for SystemTime {
    fn into_av(self) -> AttributeValue {
        DateTime::<Utc>::from(self).into_av()
    }
}