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//! Singapore calendars.
//!
//! Port of `ql/time/calendars/singapore.{hpp,cpp}`.
use crate::shared::shared;
use crate::time::calendar::{Calendar, CalendarImpl, is_weekend_sat_sun, western_easter_monday};
use crate::time::date::{Date, Month, Year};
use crate::time::weekday::Weekday;
/// Last year for which Singapore'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;
/// Singapore markets.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Market {
/// Singapore exchange.
Sgx,
}
/// The Singapore calendars.
///
/// # Accuracy
///
/// Singapore'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 Singapore;
impl Singapore {
/// Builds a Singapore calendar for the given `market`.
///
/// QuantLib defaults the market to `SGX`.
pub fn new(market: Market) -> Calendar {
let imp: crate::shared::Shared<dyn CalendarImpl> = match market {
Market::Sgx => shared(SgxImpl),
};
Calendar::from_impl(imp)
}
}
struct SgxImpl;
impl CalendarImpl for SgxImpl {
fn name(&self) -> String {
"Singapore 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 dd = date.day_of_year();
let m = date.month();
let y = date.year();
assert!(
y <= HOLIDAY_HORIZON,
"Singapore public/lunar holidays are tabulated only through {HOLIDAY_HORIZON} \
(matching QuantLib); year {y} is beyond the supported horizon"
);
let em = western_easter_monday(y);
if is_weekend_sat_sun(w)
// New Year's Day
|| ((d == 1 || (d == 2 && w == Weekday::Monday)) && m == Month::January)
// Good Friday
|| (dd == em - 3)
// Labor Day
|| (d == 1 && m == Month::May)
// National Day
|| ((d == 9 || (d == 10 && w == Weekday::Monday)) && m == Month::August)
// Christmas Day
|| (d == 25 && m == Month::December)
// Chinese New Year
|| ((d == 22 || d == 23) && m == Month::January && y == 2004)
|| ((d == 9 || d == 10) && m == Month::February && y == 2005)
|| ((d == 30 || d == 31) && m == Month::January && y == 2006)
|| ((d == 19 || d == 20) && m == Month::February && y == 2007)
|| ((d == 7 || d == 8) && m == Month::February && y == 2008)
|| ((d == 26 || d == 27) && m == Month::January && y == 2009)
|| ((d == 15 || d == 16) && m == Month::January && y == 2010)
|| ((d == 23 || d == 24) && m == Month::January && y == 2012)
|| ((d == 11 || d == 12) && m == Month::February && y == 2013)
|| (d == 31 && m == Month::January && y == 2014)
|| (d == 1 && m == Month::February && y == 2014)
// Hari Raya Haji
|| ((d == 1 || d == 2) && m == Month::February && y == 2004)
|| (d == 21 && m == Month::January && y == 2005)
|| (d == 10 && m == Month::January && y == 2006)
|| (d == 2 && m == Month::January && y == 2007)
|| (d == 20 && m == Month::December && y == 2007)
|| (d == 8 && m == Month::December && y == 2008)
|| (d == 27 && m == Month::November && y == 2009)
|| (d == 17 && m == Month::November && y == 2010)
|| (d == 26 && m == Month::October && y == 2012)
|| (d == 15 && m == Month::October && y == 2013)
|| (d == 6 && m == Month::October && y == 2014)
// Vesak Poya Day
|| (d == 2 && m == Month::June && y == 2004)
|| (d == 22 && m == Month::May && y == 2005)
|| (d == 12 && m == Month::May && y == 2006)
|| (d == 31 && m == Month::May && y == 2007)
|| (d == 18 && m == Month::May && y == 2008)
|| (d == 9 && m == Month::May && y == 2009)
|| (d == 28 && m == Month::May && y == 2010)
|| (d == 5 && m == Month::May && y == 2012)
|| (d == 24 && m == Month::May && y == 2013)
|| (d == 13 && m == Month::May && y == 2014)
// Deepavali
|| (d == 11 && m == Month::November && y == 2004)
|| (d == 8 && m == Month::November && y == 2007)
|| (d == 28 && m == Month::October && y == 2008)
|| (d == 16 && m == Month::November && y == 2009)
|| (d == 5 && m == Month::November && y == 2010)
|| (d == 13 && m == Month::November && y == 2012)
|| (d == 2 && m == Month::November && y == 2013)
|| (d == 23 && m == Month::October && y == 2014)
// Diwali
|| (d == 1 && m == Month::November && y == 2005)
// Hari Raya Puasa
|| ((d == 14 || d == 15) && m == Month::November && y == 2004)
|| (d == 3 && m == Month::November && y == 2005)
|| (d == 24 && m == Month::October && y == 2006)
|| (d == 13 && m == Month::October && y == 2007)
|| (d == 1 && m == Month::October && y == 2008)
|| (d == 21 && m == Month::September && y == 2009)
|| (d == 10 && m == Month::September && y == 2010)
|| (d == 20 && m == Month::August && y == 2012)
|| (d == 8 && m == Month::August && y == 2013)
|| (d == 28 && m == Month::July && y == 2014)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2019-01/2019%20DT%20Calendar.pdf
if y == 2019
&& (
// Chinese New Year
((d == 5 || d == 6) && m == Month::February)
// Vesak Poya Day
|| (d == 20 && m == Month::May)
// Hari Raya Puasa
|| (d == 5 && m == Month::June)
// Hari Raya Haji
|| (d == 12 && m == Month::August)
// Deepavali
|| (d == 28 && m == Month::October)
)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2020-11/SGX%20Derivatives%20Trading%20Calendar%202020_Dec%20Update_D3.pdf
if y == 2020
&& (
// Chinese New Year
(d == 27 && m == Month::January)
// Vesak Poya Day
|| (d == 7 && m == Month::May)
// Hari Raya Puasa
|| (d == 25 && m == Month::May)
// Hari Raya Haji
|| (d == 31 && m == Month::July)
// Deepavali
|| (d == 14 && m == Month::November)
)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2021-07/SGX_Derivatives%20Trading%20Calendar%202021%20%28Final%20-%20Jul%29.pdf
if y == 2021
&& (
// Chinese New Year
(d == 12 && m == Month::February)
// Hari Raya Puasa
|| (d == 13 && m == Month::May)
// Vesak Poya Day
|| (d == 26 && m == Month::May)
// Hari Raya Haji
|| (d == 20 && m == Month::July)
// Deepavali
|| (d == 4 && m == Month::November)
)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2022-06/DT%20Trading%20Calendar%202022%20%28Final%29.pdf
if y == 2022
&& (
// Chinese New Year
((d == 1 || d == 2) && m == Month::February)
// Labour Day
|| (d == 2 && m == Month::May)
// Hari Raya Puasa
|| (d == 3 && m == Month::May)
// Vesak Poya Day
|| (d == 16 && m == Month::May)
// Hari Raya Haji
|| (d == 11 && m == Month::July)
// Deepavali
|| (d == 24 && m == Month::October)
// Christmas Day
|| (d == 26 && m == Month::December)
)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2023-01/SGX%20Calendar%202023_0.pdf
if y == 2023
&& (
// Chinese New Year
((d == 23 || d == 24) && m == Month::January)
// Hari Raya Puasa
|| (d == 22 && m == Month::April)
// Vesak Poya Day
|| (d == 2 && m == Month::June)
// Hari Raya Haji
|| (d == 29 && m == Month::June)
// Public holiday on polling day
|| (d == 1 && m == Month::September)
// Deepavali
|| (d == 13 && m == Month::November)
)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2024-01/SGX%20Calendar%202024_2.pdf
if y == 2024
&& (
// Chinese New Year
(d == 12 && m == Month::February)
// Hari Raya Puasa
|| (d == 10 && m == Month::April)
// Vesak Poya Day
|| (d == 22 && m == Month::May)
// Hari Raya Haji
|| (d == 17 && m == Month::June)
// Deepavali
|| (d == 31 && m == Month::October)
)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2025-07/DT%20Trading%20Calendar%202025%20%28updated%2031%20Jul%202025%29.pdf
if y == 2025
&& (
// Chinese New Year
((d == 29 || d == 30) && m == Month::January)
// Hari Raya Puasa
|| (d == 31 && m == Month::March)
// Vesak Poya Day
|| (d == 12 && m == Month::May)
// Deepavali
|| (d == 20 && m == Month::October)
)
{
return false;
}
// https://api2.sgx.com/sites/default/files/2026-01/SGX%20Calendar%202026_2.pdf
if y == 2026
&& (
// Chinese New Year
((d == 17 || d == 18) && m == Month::February)
// Hari Raya Puasa
|| (d == 20 && m == Month::March)
// Hari Raya Haji
|| (d == 27 && m == Month::May)
// Vesak Day (Sunday May 31st, observed Monday June 1st)
|| (d == 1 && m == Month::June)
// Deepavali (Sunday Nov 8th, observed Monday Nov 9th)
|| (d == 9 && m == Month::November)
)
{
return false;
}
true
}
}
#[cfg(test)]
mod tests {
use super::*;
// Spot-checks against known Singapore holidays; not a full transcription of
// test-suite/calendars.cpp.
#[test]
fn name_matches_quantlib() {
assert_eq!(Singapore::new(Market::Sgx).name(), "Singapore exchange");
}
#[test]
fn fixed_holidays() {
let c = Singapore::new(Market::Sgx);
// New Year's Day (unconditional on the 1st)
assert!(c.is_holiday(Date::new(1, Month::January, 2019)));
// Labour Day
assert!(c.is_holiday(Date::new(1, Month::May, 2019)));
// Christmas Day
assert!(c.is_holiday(Date::new(25, Month::December, 2019)));
}
#[test]
fn weekend_rule() {
let c = Singapore::new(Market::Sgx);
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 = Singapore::new(Market::Sgx);
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 = Singapore::new(Market::Sgx);
let _ = c.is_business_day(Date::new(1, Month::January, HOLIDAY_HORIZON + 1));
}
}