simple-datetime-rs 0.3.0

use simple_datetime_rs::{Date, DateTime, Format, Time};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("=== simple-datetime-rs Formatting Demo ===\n");

    let date = Date::new(2023, 6, 15);
    let time = Time::new(14, 30, 45);
    let datetime = DateTime::new(date, time, 0);

    println!("1. Basic Date Formatting:");
    println!("   %Y-%m-%d: {}", date.format("%Y-%m-%d")?);
    println!("   %B %d, %Y: {}", date.format("%B %d, %Y")?);
    println!("   %A, %B %d, %Y: {}", date.format("%A, %B %d, %Y")?);
    println!("   %D (MM/DD/YY): {}", date.format("%D")?);
    println!("   %F (YYYY-MM-DD): {}", date.format("%F")?);
    println!("   Day of year (%j): {}", date.format("%j")?);
    println!();

    println!("2. Basic Time Formatting:");
    println!("   %H:%M:%S: {}", time.format("%H:%M:%S")?);
    println!("   %I:%M %p: {}", time.format("%I:%M %p")?);
    println!("   %T (HH:MM:SS): {}", time.format("%T")?);
    println!();

    println!("3. DateTime Formatting:");
    println!(
        "   %Y-%m-%d %H:%M:%S: {}",
        datetime.format("%Y-%m-%d %H:%M:%S")?
    );
    println!(
        "   %A, %B %d, %Y at %I:%M %p: {}",
        datetime.format("%A, %B %d, %Y at %I:%M %p")?
    );
    println!("   %+ (ISO 8601): {}", datetime.format("%+")?);
    println!();

    println!("4. Timezone Formatting:");
    let dt_utc = DateTime::new(date, time, 0);
    let dt_est = DateTime::new(date, time, -300);
    let dt_cet = DateTime::new(date, time, 120);

    println!("   UTC (%z): {}", dt_utc.format("%z")?);
    println!("   EST (%:z): {}", dt_est.format("%:z")?);
    println!("   CET (%:z): {}", dt_cet.format("%:z")?);
    println!();

    println!("5. Microsecond Formatting:");
    let time_with_micros = Time::new_with_microseconds(14, 30, 45, 123456);
    println!(
        "   %H:%M:%S.%f: {}",
        time_with_micros.format("%H:%M:%S.%f")?
    );
    println!("   %T.%f: {}", time_with_micros.format("%T.%f")?);
    println!();

    println!("6. Custom Format Strings:");
    println!("   Log format: {}", datetime.format("[%Y-%m-%d %H:%M:%S]")?);
    println!("   File name: {}", datetime.format("backup_%Y%m%d_%H%M%S")?);
    println!(
        "   Human readable: {}",
        datetime.format("%A, %B %d, %Y at %I:%M %p")?
    );
    println!("   Progress: {}% complete", datetime.format("100%%")?);
    println!();

    println!("7. DateTime::now() - Current Time:");
    let now = DateTime::now();
    println!("   Current time: {}", now.format("%Y-%m-%d %H:%M:%S")?);
    println!("   Current time (12-hour): {}", now.format("%I:%M:%S %p")?);
    println!(
        "   Current time (full): {}",
        now.format("%A, %B %d, %Y at %I:%M:%S %p")?
    );
    println!();

    println!("8. Weekday Information:");
    let dates = vec![
        Date::new(2023, 6, 12),
        Date::new(2023, 6, 13),
        Date::new(2023, 6, 14),
        Date::new(2023, 6, 15),
        Date::new(2023, 6, 16),
        Date::new(2023, 6, 17),
        Date::new(2023, 6, 18),
    ];

    for date in dates {
        println!(
            "   {}: {} (%w)",
            date.format("%Y-%m-%d")?,
            date.format("%A")?
        );
    }
    println!();

    println!("9. Month Names:");
    for month in 1..=12 {
        let test_date = Date::new(2023, month, 1);
        println!(
            "   Month {}: {} ({})",
            month,
            test_date.format("%B")?,
            test_date.format("%b")?
        );
    }
    println!();

    println!("10. Error Handling:");
    match "invalid format %X".parse::<Date>() {
        Ok(_) => println!("   Unexpected success"),
        Err(e) => println!("   Expected error: {}", e),
    }

    match datetime.format("%X") {
        Ok(_) => println!("   Unexpected success"),
        Err(e) => println!("   Expected error: {}", e),
    }

    println!("\n=== Formatting Demo Complete ===");
    Ok(())
}