use chrono::{NaiveDate, Duration};
/// Adds a specified number of weeks to a given NaiveDate safely.
///
/// @param base_date - The original NaiveDate.
/// @param weeks - The number of weeks to add (can also be negative to subtract).
/// @return - An Option<NaiveDate> returning Some(date) on success, or None on overflow.
pub fn add_weeks_to_date(base_date: NaiveDate, weeks: i64) -> Option<NaiveDate> {
// chrono::Duration provides a built-in .weeks() constructor.
// checked_add_signed safely handles calendar bounds, returning None instead of panicking on overflow.
base_date.checked_add_signed(Duration::weeks(weeks))
}
fn main() {
// Initialize a sample date: November 8, 2026 using the safe from_ymd_opt constructor
let target_date = NaiveDate::from_ymd_opt(2026, 11, 8).expect("Invalid date provided");
let weeks_to_add = 4;
// Perform the addition with error handling for potential date overflows
match add_weeks_to_date(target_date, weeks_to_add) {
Some(result_date) => {
println!("Original date: {}", target_date);
println!("After adding {} weeks: {}", weeks_to_add, result_date);
}
None => {
eprintln!("Error: Date calculation resulted in an overflow or underflow.");
}
}
}
/*
run:
Original date: 2026-11-08
After adding 4 weeks: 2026-12-06
*/
