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//! Taiwanese calendars.
//!
//! Port of `ql/time/calendars/taiwan.{hpp,cpp}`.
//!
//! The per-year holiday lists and nested `if (y == ....)` blocks are kept
//! verbatim from the C++ source (day ranges as `>= .. && <= ..`, one nested
//! `if` per year), so the matching style lints are allowed module-wide.
#![allow(
clippy::manual_range_contains,
clippy::nonminimal_bool,
clippy::collapsible_if
)]
use crate::shared::shared;
use crate::time::calendar::{Calendar, CalendarImpl, is_weekend_sat_sun};
use crate::time::date::{Date, Month, Year};
use crate::time::weekday::Weekday;
/// Last year for which Taiwan's public/lunar holidays are tabulated
/// (matching QuantLib's data). Queries beyond this year cannot be answered
/// reliably and panic rather than silently omitting holidays.
const HOLIDAY_HORIZON: Year = 2026;
/// Taiwanese markets.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Market {
/// Taiwan stock exchange.
Tsec,
}
/// The Taiwanese calendars.
///
/// # Accuracy
///
/// Taiwan's public/lunar holidays are tabulated (from QuantLib) only through
/// 2026. Querying a date after 2026 panics rather than silently returning an
/// unreliable business-day result.
pub struct Taiwan;
impl Taiwan {
/// Builds a Taiwanese calendar for the given `market`.
///
/// QuantLib defaults the market to `TSEC`.
pub fn new(market: Market) -> Calendar {
let imp: crate::shared::Shared<dyn CalendarImpl> = match market {
Market::Tsec => shared(TsecImpl),
};
Calendar::from_impl(imp)
}
}
struct TsecImpl;
impl CalendarImpl for TsecImpl {
fn name(&self) -> String {
"Taiwan stock exchange".to_string()
}
fn is_weekend(&self, w: Weekday) -> bool {
is_weekend_sat_sun(w)
}
fn is_business_day(&self, date: Date) -> bool {
let w = date.weekday();
let d = date.day_of_month();
let m = date.month();
let y = date.year();
assert!(
y <= HOLIDAY_HORIZON,
"Taiwan public/lunar holidays are tabulated only through {HOLIDAY_HORIZON} \
(matching QuantLib); year {y} is beyond the supported horizon"
);
if is_weekend_sat_sun(w)
// New Year's Day
|| (d == 1 && m == Month::January)
// Peace Memorial Day
|| (d == 28 && m == Month::February)
// Labor Day
|| (d == 1 && m == Month::May)
// Double Tenth
|| (d == 10 && m == Month::October)
{
return false;
}
if y == 2002 {
// Dragon Boat Festival and Moon Festival fall on Saturday
if
// Chinese Lunar New Year
(d >= 9 && d <= 17 && m == Month::February)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
{
return false;
}
}
if y == 2003 {
// Tomb Sweeping Day falls on Saturday
if
// Chinese Lunar New Year
((d >= 31 && m == Month::January) || (d <= 5 && m == Month::February))
// Dragon Boat Festival
|| (d == 4 && m == Month::June)
// Moon Festival
|| (d == 11 && m == Month::September)
{
return false;
}
}
if y == 2004 {
// Tomb Sweeping Day falls on Sunday
if
// Chinese Lunar New Year
(d >= 21 && d <= 26 && m == Month::January)
// Dragon Boat Festival
|| (d == 22 && m == Month::June)
// Moon Festival
|| (d == 28 && m == Month::September)
{
return false;
}
}
if y == 2005 {
// Dragon Boat and Moon Festival fall on Saturday or Sunday
if
// Chinese Lunar New Year
(d >= 6 && d <= 13 && m == Month::February)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// make up for Labor Day, not seen in other years
|| (d == 2 && m == Month::May)
{
return false;
}
}
if y == 2006 {
// Dragon Boat and Moon Festival fall on Saturday or Sunday
if
// Chinese Lunar New Year
((d >= 28 && m == Month::January) || (d <= 5 && m == Month::February))
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// Dragon Boat Festival
|| (d == 31 && m == Month::May)
// Moon Festival
|| (d == 6 && m == Month::October)
{
return false;
}
}
if y == 2007 {
if
// Chinese Lunar New Year
(d >= 17 && d <= 25 && m == Month::February)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// adjusted holidays
|| (d == 6 && m == Month::April)
|| (d == 18 && m == Month::June)
// Dragon Boat Festival
|| (d == 19 && m == Month::June)
// adjusted holiday
|| (d == 24 && m == Month::September)
// Moon Festival
|| (d == 25 && m == Month::September)
{
return false;
}
}
if y == 2008 {
if
// Chinese Lunar New Year
(d >= 4 && d <= 11 && m == Month::February)
// Tomb Sweeping Day
|| (d == 4 && m == Month::April)
{
return false;
}
}
if y == 2009 {
if
// Public holiday
(d == 2 && m == Month::January)
// Chinese Lunar New Year
|| (d >= 24 && m == Month::January)
// Tomb Sweeping Day
|| (d == 4 && m == Month::April)
// Dragon Boat Festival
|| ((d == 28 || d == 29) && m == Month::May)
// Moon Festival
|| (d == 3 && m == Month::October)
{
return false;
}
}
if y == 2010 {
if
// Chinese Lunar New Year
(d >= 13 && d <= 21 && m == Month::January)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// Dragon Boat Festival
|| (d == 16 && m == Month::May)
// Moon Festival
|| (d == 22 && m == Month::September)
{
return false;
}
}
if y == 2011 {
if
// Spring Festival
(d >= 2 && d <= 7 && m == Month::February)
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// Labour Day
|| (d == 2 && m == Month::May)
// Dragon Boat Festival
|| (d == 6 && m == Month::June)
// Mid-Autumn Festival
|| (d == 12 && m == Month::September)
{
return false;
}
}
if y == 2012 {
if
// Spring Festival
(d >= 23 && d <= 27 && m == Month::January)
// Peace Memorial Day
|| (d == 27 && m == Month::February)
// Children's Day
// Tomb Sweeping Day
|| (d == 4 && m == Month::April)
// Labour Day
|| (d == 1 && m == Month::May)
// Dragon Boat Festival
|| (d == 23 && m == Month::June)
// Mid-Autumn Festival
|| (d == 30 && m == Month::September)
// Memorial Day:
// Founding of the Republic of China
|| (d == 31 && m == Month::December)
{
return false;
}
}
if y == 2013 {
if
// Spring Festival
(d >= 10 && d <= 15 && m == Month::February)
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// Labour Day
|| (d == 1 && m == Month::May)
// Dragon Boat Festival
|| (d == 12 && m == Month::June)
// Mid-Autumn Festival
|| (d >= 19 && d <= 20 && m == Month::September)
{
return false;
}
}
if y == 2014 {
if
// Lunar New Year
(d >= 28 && d <= 30 && m == Month::January)
// Spring Festival
|| ((d == 31 && m == Month::January) || (d <= 4 && m == Month::February))
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// Dragon Boat Festival
|| (d == 2 && m == Month::June)
// Mid-Autumn Festival
|| (d == 8 && m == Month::September)
{
return false;
}
}
if y == 2015 {
if
// adjusted holidays
(d == 2 && m == Month::January)
// Lunar New Year
|| (d >= 18 && d <= 23 && m == Month::February)
// adjusted holidays
|| (d == 27 && m == Month::February)
// adjusted holidays
|| (d == 3 && m == Month::April)
// adjusted holidays
|| (d == 6 && m == Month::April)
// adjusted holidays
|| (d == 19 && m == Month::June)
// adjusted holidays
|| (d == 28 && m == Month::September)
// adjusted holidays
|| (d == 9 && m == Month::October)
{
return false;
}
}
if y == 2016 {
if
// Lunar New Year
(d >= 8 && d <= 12 && m == Month::February)
// adjusted holidays
|| (d == 29 && m == Month::February)
// Children's Day
|| (d == 4 && m == Month::April)
// adjusted holidays
|| (d == 5 && m == Month::April)
// adjusted holidays
|| (d == 2 && m == Month::May)
// Dragon Boat Festival
|| (d == 9 && m == Month::June)
// adjusted holidays
|| (d == 10 && m == Month::June)
// Mid-Autumn Festival
|| (d == 15 && m == Month::September)
// adjusted holidays
|| (d == 16 && m == Month::September)
{
return false;
}
}
if y == 2017 {
if
// adjusted holidays
(d == 2 && m == Month::January)
// Lunar New Year
|| ((d >= 27 && m == Month::January) || (d == 1 && m == Month::February))
// adjusted holidays
|| (d == 27 && m == Month::February)
// adjusted holidays
|| (d == 3 && m == Month::April)
// Children's Day
|| (d == 4 && m == Month::April)
// adjusted holidays
|| (d == 29 && m == Month::May)
// Dragon Boat Festival
|| (d == 30 && m == Month::May)
// Mid-Autumn Festival
|| (d == 4 && m == Month::October)
// adjusted holidays
|| (d == 9 && m == Month::October)
{
return false;
}
}
if y == 2018 {
if
// Lunar New Year
(d >= 15 && d <= 20 && m == Month::February)
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// adjusted holidays
|| (d == 6 && m == Month::April)
// Dragon Boat Festival
|| (d == 18 && m == Month::June)
// Mid-Autumn Festival
|| (d == 24 && m == Month::September)
// adjusted holidays
|| (d == 31 && m == Month::December)
{
return false;
}
}
if y == 2019 {
if
// Lunar New Year
(d >= 4 && d <= 8 && m == Month::February)
// adjusted holidays
|| (d == 1 && m == Month::March)
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// Dragon Boat Festival
|| (d == 7 && m == Month::June)
// Mid-Autumn Festival
|| (d == 13 && m == Month::September)
// adjusted holidays
|| (d == 11 && m == Month::October)
{
return false;
}
}
if y == 2020 {
if
// adjusted holiday
(d == 23 && m == Month::January)
// Lunar New Year
|| (d >= 24 && d <= 29 && m == Month::January)
// adjusted holiday
|| (d == 2 && m == Month::April)
// adjusted holiday
|| (d == 3 && m == Month::April)
// Dragon Boat Festival
|| (d == 25 && m == Month::June)
// adjusted holiday
|| (d == 26 && m == Month::June)
// Mid-Autumn Festival
|| (d == 1 && m == Month::October)
// adjusted holiday
|| (d == 2 && m == Month::October)
// adjusted holiday
|| (d == 9 && m == Month::October)
{
return false;
}
}
if y == 2021 {
// Tomb Sweeping Day falls on Sunday
if
// adjusted holiday
(d == 10 && m == Month::February)
// Lunar New Year
|| (d >= 11 && d <= 16 && m == Month::February)
// adjusted holiday
|| (d == 1 && m == Month::March)
// Children's Day
|| (d == 2 && m == Month::April)
// adjusted holiday
|| (d == 5 && m == Month::April)
// adjusted holiday
|| (d == 30 && m == Month::April)
// Dragon Boat Festival
|| (d == 14 && m == Month::June)
// adjusted holiday
|| (d == 20 && m == Month::September)
// Mid-Autumn Festival
|| (d == 21 && m == Month::September)
// adjusted holiday
|| (d == 11 && m == Month::October)
// adjusted holiday
|| (d == 31 && m == Month::December)
{
return false;
}
}
if y == 2022 {
// Mid-Autumn Festival falls on Saturday
if
// Lunar New Year
((d == 31 && m == Month::January) || (d <= 4 && m == Month::February))
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// adjusted holiday
|| (d == 2 && m == Month::May)
// Dragon Boat Festival
|| (d == 3 && m == Month::June)
// adjusted holiday
|| (d == 9 && m == Month::September)
{
return false;
}
}
if y == 2023 {
if
// adjusted holiday
(d == 2 && m == Month::January)
// adjusted holiday
|| (d == 20 && m == Month::January)
// Lunar New Year
|| (d >= 21 && d <= 24 && m == Month::January)
// adjusted holiday
|| (d >= 25 && d <= 27 && m == Month::January)
// adjusted holiday
|| (d == 27 && m == Month::February)
// adjusted holiday
|| (d == 3 && m == Month::April)
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb Sweeping Day
|| (d == 5 && m == Month::April)
// Dragon Boat Festival
|| (d == 22 && m == Month::June)
// adjusted holiday
|| (d == 23 && m == Month::June)
// Mid-Autumn Festival
|| (d == 29 && m == Month::September)
// adjusted holiday
|| (d == 9 && m == Month::October)
{
return false;
}
}
if y == 2024 {
if
// adjusted holiday
(d == 8 && m == Month::February)
// Lunar New Year
|| (d >= 9 && d <= 12 && m == Month::February)
// adjusted holiday
|| (d >= 13 && d <= 14 && m == Month::February)
// Children's Day
|| (d == 4 && m == Month::April)
// Tomb-sweeping Day
|| (d == 5 && m == Month::April)
// Dragon Boat Festival
|| (d == 10 && m == Month::June)
// Mid-autumn/Moon Festival
|| (d == 17 && m == Month::September)
{
return false;
}
}
if y == 2025 {
// Dragon Boat Festival falls on Saturday
if
// adjusted holiday
(d >= 23 && d <= 24 && m == Month::January)
// Lunar New Year
|| (d >= 27 && d <= 31 && m == Month::January)
// adjusted holiday
|| (d == 3 && m == Month::April)
// Children's Day & Tomb-sweeping Day
|| (d == 4 && m == Month::April)
// adjusted holiday
|| (d == 30 && m == Month::May)
// Mid-Autumn Festival
|| (d == 6 && m == Month::October)
{
return false;
}
}
if y == 2026 {
if
// adjusted holiday
(d >= 12 && d <= 13 && m == Month::February)
// Lunar New Year
|| (d >= 16 && d <= 20 && m == Month::February)
// adjusted holiday (Peace Memorial Day falls on Saturday)
|| (d == 27 && m == Month::February)
// adjusted holiday
|| (d == 3 && m == Month::April)
// adjusted holiday (Tomb-sweeping Day falls on Sunday)
|| (d == 6 && m == Month::April)
// Dragon Boat Festival
|| (d == 19 && m == Month::June)
// Mid-Autumn Festival
|| (d == 25 && m == Month::September)
// adjusted holiday (National Day falls on Saturday)
|| (d == 9 && m == Month::October)
{
return false;
}
}
true
}
}
#[cfg(test)]
mod tests {
use super::*;
// Spot-checks against known Taiwanese holidays; not a full transcription of
// test-suite/calendars.cpp.
#[test]
fn name_matches_quantlib() {
assert_eq!(Taiwan::new(Market::Tsec).name(), "Taiwan stock exchange");
}
#[test]
fn fixed_holidays() {
let c = Taiwan::new(Market::Tsec);
// New Year's Day
assert!(c.is_holiday(Date::new(1, Month::January, 2019)));
// Peace Memorial Day
assert!(c.is_holiday(Date::new(28, Month::February, 2019)));
// Labor Day
assert!(c.is_holiday(Date::new(1, Month::May, 2019)));
// Double Tenth
assert!(c.is_holiday(Date::new(10, Month::October, 2019)));
}
#[test]
fn weekend_rule() {
let c = Taiwan::new(Market::Tsec);
assert!(c.is_weekend(Weekday::Saturday));
assert!(c.is_weekend(Weekday::Sunday));
assert!(!c.is_weekend(Weekday::Monday));
}
#[test]
fn in_horizon_query_works() {
let c = Taiwan::new(Market::Tsec);
assert!(c.is_holiday(Date::new(1, Month::January, HOLIDAY_HORIZON)));
}
#[test]
#[should_panic(expected = "beyond the supported horizon")]
fn beyond_horizon_panics() {
let c = Taiwan::new(Market::Tsec);
let _ = c.is_business_day(Date::new(1, Month::January, HOLIDAY_HORIZON + 1));
}
}