vizkit 0.1.1

A rendering-agnostic kit for data visualization
Documentation 
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use super::interval::Timing;
use chrono::{DateTime, TimeDelta, Timelike, Utc};

/// Hour interval
pub struct Hour;
impl Timing for Hour {
    fn floor(&self, date: DateTime<Utc>) -> Option<DateTime<Utc>> {
        date.with_minute(0)
            .and_then(|date| date.with_second(0))
            .and_then(|date| date.with_nanosecond(0))
    }

    fn offset(&self, date: DateTime<Utc>, step: i64) -> DateTime<Utc> {
        date + TimeDelta::hours(step)
    }

    fn count(&self, start: DateTime<Utc>, end: DateTime<Utc>) -> i64 {
        (end - start).num_hours()
    }

    fn field(&self, date: DateTime<Utc>) -> u32 {
        date.hour()
    }
}