bdays

Provides functions to perform business days calculation between dates, given a Holiday Calendar.

A Business Day is defined as a weekday that is not a holiday.

To check if a date is a holiday, you must provide an implementation of the HolidayCalendar trait.

This crate is a port of BusinessDays.jl to the Rust programming language.

Provided Holiday Calendars

This crate provides a set of built-in holiday calendars in the bdays::calendars submodule.

• bdays::calendars::WeekendsOnly : accounts only weekends

• bdays::calendars::brazil::BRSettlement : Brazilian banking holidays

• bdays::calendars::brazil::BrazilExchange : B3 Exchange holidays (http://www.b3.com.br)

• bdays::calendars::us::USSettlement : United States federal holidays

Usage

Add these dependencies to your Cargo.toml file.

toml [dependencies] bdays = "0.1" chrono = "0.4"

The following example shows the basic functions from this package.

```rust use chrono::NaiveDate; use bdays::HolidayCalendar;

fn main() { // creates a holiday calendar instance let cal = bdays::calendars::WeekendsOnly;

let d0 = NaiveDate::from_ymd(2018, 11, 22);
let d1 = NaiveDate::from_ymd(2018, 11, 24);
let d2 = NaiveDate::from_ymd(2018, 11, 26);

// checks if a date is a holiday
assert_eq!( cal.is_holiday(d0), false );

// checks if a date is a business day
assert_eq!( cal.is_bday(d0), true  );
assert_eq!( cal.is_bday(d1), false );

// adjusts to the last/next business day
assert_eq!( cal.to_bday(d1, false), NaiveDate::from_ymd(2018, 11, 23) );
assert_eq!( cal.to_bday(d1, true) , d2 );

// advances a number of business days
assert_eq!( cal.advance_bdays(d0,  2), d2 );
assert_eq!( cal.advance_bdays(d2, -2), d0 );

// returns the number of business days between dates
assert_eq!( cal.bdays(d0, d2),  2);
assert_eq!( cal.bdays(d2, d0), -2);

} ```

HolidayCalendarCache

As a motivation, this example might take some time to finish. ```rust use chrono::NaiveDate; use bdays::HolidayCalendar;

let cal = bdays::calendars::brazil::BRSettlement; let d0 = NaiveDate::fromymd(2001, 2, 1); let d1 = NaiveDate::fromymd(2100, 2, 1);

for _i in 0..30 { cal.bdays(d0, d1); } `` You can useHolidayCalendarCache` to perform fast business days calculation for a given range of dates.

```rust use chrono::NaiveDate; use bdays::HolidayCalendar;

let cal = bdays::HolidayCalendarCache::new( bdays::calendars::brazil::BRSettlement, NaiveDate::fromymd(1980, 1, 1), NaiveDate::fromymd(2100, 12, 31) );

let d0 = NaiveDate::fromymd(2001, 2, 1); let d1 = NaiveDate::fromymd(2100, 2, 1);

for _i in 0..30 { cal.bdays(d0, d1); } ```