DateTime (DTT)

A Rust library for parsing, validating, manipulating, and formatting dates and times.

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Overview

The DateTime (DTT) library is a comprehensive, flexible toolkit for managing dates and times in Rust. It includes functions, macros, and data structures that enable you to create, parse, validate, and format date-time objects with minimal effort.

You can construct DateTime objects in UTC or in a fixed offset timezone, ensuring accurate date and time information for varied use cases. The library also offers validation methods, which help maintain precision and correctness in time-critical operations.

Features

The DateTime (DTT) library provides:

• Core Fields

  • datetime: Internal PrimitiveDateTime (UTC by default)
  • offset: A UtcOffset representing the timezone offset from UTC

• Core Methods

  • new(): Create a DateTime with the current UTC time
  • new_with_tz(tz: &str): Construct a DateTime in a specified timezone
  • new_with_custom_offset(hours: i8, minutes: i8): Create a DateTime with a custom offset
  • from_components(...): Build a DateTime from year, month, day, hour, minute, second, and offset
  • update(&self): Refresh the DateTime to the current instant (preserving offset)
  • now(): Return the current DateTime (an alias for new())
  • from_str(...): Parse a DateTime from a string (implements FromStr)
  • default(): Provide the current UTC time by default

• Parsing and Formatting

  • parse(...): Parse a date-time string into a DateTime
  • parse_custom_format(...): Use a custom format pattern for parsing
  • format(...): Format a DateTime with a user-defined pattern
  • format_rfc3339(&self): Output RFC 3339 text
  • format_iso8601(&self): Output ISO 8601 text

• Date-Time Manipulation

  • convert_to_tz(...): Switch to a different timezone
  • unix_timestamp(&self): Retrieve the Unix timestamp
  • add_days(...), add_months(...), add_years(...): Advance the date by days, months, or years
  • sub_months(...), sub_years(...): Move the date backwards by months or years
  • next_day(), previous_day(): Obtain the following or preceding day
  • start_of_week(), end_of_week(): Jump to the beginning or end of the week
  • start_of_month(), end_of_month(): Jump to the beginning or end of the month
  • start_of_year(), end_of_year(): Jump to the beginning or end of the year
  • is_within_range(&self, start: &Self, end: &Self): Check if a date-time is in a specific range
  • duration_since(&self, other: &Self): Calculate duration between two DateTimes

• Getters

  • year(...), month(...), day(...), hour(...), minute(...), second(...), microsecond(...)
  • weekday(...), ordinal(...), iso_week(...), offset(...)

• Setters

  • set_date(...): Update the year, month, and day
  • set_time(...): Update the hour, minute, and second

• Validation

  • is_valid_day(...), is_valid_hour(...), is_valid_minute(...), is_valid_second(...)
  • is_valid_month(...), is_valid_year(...), is_valid_microsecond(...)
  • is_valid_ordinal(...), is_valid_iso_week(...), is_valid_time(...)
  • is_valid_iso_8601(date: &str): Check if an input is valid ISO 8601

• Utility Functions

  • format_time_in_timezone(...): Format a date-time for a specified timezone

• Arithmetic Operations

  • Add<Duration> and Sub<Duration> traits for adding or subtracting durations

• Comparison Operations

  • PartialOrd and Ord for ordering comparisons

• Hashing

  • Hash implementation for use with hash-based collections

• Macros

  • Examples include dtt_now!(), dtt_parse!(), dtt_add_days!(), and many more, simplifying routine tasks like date parsing or arithmetic

• Helper Functions

  • days_in_month(year, month): Returns the number of days in a specific month and year
  • is_leap_year(year): Checks if a year is a leap year

• Error Handling

  • DateTimeError: Comprehensive error handling for invalid dates, times, or offsets

• Timezone Support

  • Create or convert DateTime objects across multiple named timezones or custom offsets

• Serialisation and Deserialisation

  • serde-enabled for easy reading and writing of DateTime objects

Installation

Add this to your Cargo.toml:

[dependencies]
dtt = "0.0.9"

Then in your main.rs or lib crate:

extern crate dtt;
use dtt::*;

Usage

Below are some quick examples showing how to use the core features of the DateTime (DTT) library.

Basic Usage

use dtt::datetime::DateTime;
use dtt::dtt_print;

// Create a new DateTime in UTC
let now = DateTime::new();
dtt_print!(now);

// Create a DateTime in a specified timezone
let ny_time = DateTime::new_with_tz("EST").expect("Valid timezone");
println!("Current time in New York: {}", ny_time);

// Parse a date-time string
let date = DateTime::parse("2023-05-20T15:30:00Z").expect("Valid date and time");
println!("Parsed date: {}", date);

// Add days to a date-time
let future_date = date.add_days(7).expect("Should be valid");
println!("Date after 7 days: {}", future_date);

Macro Usage

The library includes macros that streamline common operations:

use dtt::{dtt_now, dtt_parse, dtt_add_days};

let now = dtt_now!();
let parsed_date = dtt_parse!("2023-05-20T15:30:00Z").expect("Valid date");
let future_date = dtt_add_days!(parsed_date, 7).expect("Should be valid");

Error Handling

The DateTimeError enum is used to handle invalid or out-of-range dates and times:

use dtt::datetime::DateTime;
use dtt::error::DateTimeError;

fn example_with_error_handling() -> Result<(), DateTimeError> {
    let date = DateTime::parse("2023-05-20T15:30:00Z")?;
    println!("Parsed date: {}", date);

    // Attempt to parse an invalid date string
    let result = DateTime::parse("2023-13-20T15:30:00Z");
    match result {
        Ok(_) => println!("Unexpected success."),
        Err(e) => println!("Failed to parse date-time: {}", e),
    }

    Ok(())
}

Documentation

Comprehensive API documentation is available at:

• Website
• Docs.rs
• https://doc.dttlib.com/

Rust Version Compatibility

Requires rustc 1.56.0 or above.

Contributing

All contributions are appreciated! Please follow our contributing instructions for details on reporting issues, requesting features, or submitting pull requests. Contributions are subject to Rust's Code of Conduct.

By submitting any contribution, you agree to license your contribution under the same dual licence chosen by this project.

License

Licensed under either of these:

• Apache License, Version 2.0
• MIT license

You may select either licence as needed.

Credits and Acknowledgements

Many thanks to all the contributors of the DateTime (DTT) Library. We also extend our gratitude to the Rust Reddit community for their helpful suggestions and feedback.