spacecell 0.1.0

Datetime library with ISO8601/RFC3339 parsing, calendar arithmetic, and business day calculations
Documentation 
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// Note: this module was originally in `Minarrow` and conforms with the Apache Arrow datetime format.
// It is best to keep it consistent but disregard the Arrow/Minarrow context..

//! # **TimeUnits Module** - *Arrow Datetime Units*
//!
//! Defines time and interval units used by temporal arrays in Minarrow.
//!  
//! `TimeUnit` standardises second, millisecond, microsecond, nanosecond, and day resolution
//! across `DatetimeArray32` and `DatetimeArray64`.  
//! `IntervalUnit` specifies year–month, day–time, or month–day–nanosecond intervals
//! for representing durations or periods in `DatetimeArray` values.
//!  
//! Both integrate with Apache Arrow’s native types for FFI compatibility.

use std::fmt::{Display, Formatter, Result as FmtResult};

/// # TimeUnit
///
/// Unified time unit enumeration.
///
/// ## Purpose
/// - Combines time units for both `DatetimeArray32` and `DatetimeArray64`.
/// - Confirm time since epoch units, or a raw duration value *(depending on the `ArrowType`
/// that's attached to `Field` during `FieldArray` construction)*.
/// - Avoids proliferating variants that require explicit handling throughout match statements.
///
/// ## Behaviour
/// - Unit values are stored on the `DatetimeArray`, enabling variant-specific logic.
/// - When transmitted over FFI, an `Apache Arrow`- produces compatible native format.
#[derive(PartialEq, Eq, Clone, Copy, Debug, Default)]
pub enum TimeUnit {
    /// Seconds for Apache Arrow `Time32` and `Time64` units.
    Seconds,
    /// Milliseconds for Apache Arrow `Time32` and `Time64` units.
    Milliseconds,
    /// Microseconds for Apache Arrow `Time32` and `Time64` units.
    Microseconds,
    /// Nanoseconds for Apache Arrow `Time32` and `Time64` units.
    Nanoseconds,
    /// Default = days unspecified
    ///
    /// Apache Arrow's `Date32` and `Date64` types use days implicitly.
    #[default]
    Days,
}

impl Display for TimeUnit {
    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
        match self {
            TimeUnit::Seconds => f.write_str("Seconds"),
            TimeUnit::Milliseconds => f.write_str("Milliseconds"),
            TimeUnit::Microseconds => f.write_str("Microseconds"),
            TimeUnit::Nanoseconds => f.write_str("Nanoseconds"),
            TimeUnit::Days => f.write_str("Days"),
        }
    }
}