Add Norway calendar support (issue #142)

crates/RustQuant_time/src/calendar.rs

@@ -79,6 +79,8 @@ pub enum Market {
     Netherlands,
     /// New Zealand national calendar.
     NewZealand,
+    /// Norway national calendar.
+    Norway,
     /// Singapore national calendar.
     Singapore,
     /// United Kingdom national calendar.
@@ -431,6 +433,7 @@ impl Calendar {
                 Market::Mexico => is_holiday_impl_mexico(date),
                 Market::Netherlands => is_holiday_impl_netherlands(date),
                 Market::NewZealand => is_holiday_impl_new_zealand(date),
+                Market::Norway => is_holiday_impl_norway(date),
                 Market::Singapore => is_holiday_impl_singapore(date),
                 Market::UnitedKingdom => is_holiday_impl_united_kingdom(date),
                 Market::UnitedStates => is_holiday_impl_united_states(date),

crates/RustQuant_time/src/countries/mod.rs

@@ -101,6 +101,10 @@ pub(crate) use netherlands::*;
 pub mod new_zealand;
 pub(crate) use new_zealand::*;
 
+/// Norway holidays and calendars.
+pub mod norway;
+pub(crate) use norway::*;
+
 /// Singapore holidays and calendars.
 pub mod singapore;
 pub(crate) use singapore::*;

crates/RustQuant_time/src/countries/norway.rs

@@ -0,0 +1,70 @@
+use crate::utilities::unpack_date;
+use time::{Date, Month};
+
+pub(crate) fn is_holiday_impl_norway(date: Date) -> bool {
+    let (y, m, d, _, yd, em) = unpack_date(date, false);
+
+    if
+    // New Year's Day
+    (d == 1 && m == Month::January)
+        // Maundy Thursday
+        || yd == em - 4
+        // Good Friday
+        || yd == em - 3
+        // Easter Sunday
+        || yd == em - 1
+        // Easter Monday
+        || yd == em
+        // Labour Day
+        || (d == 1 && m == Month::May)
+        // Constitution Day
+        || (d == 17 && m == Month::May)
+        // Ascension Day
+        || yd == em + 38
+        // Whit Sunday
+        || yd == em + 48
+        // Whit Monday
+        || yd == em + 49
+        // Christmas Day
+        || (d == 25 && m == Month::December)
+        // Boxing Day
+        || (d == 26 && m == Month::December)
+        // One-off: National day of mourning after Utøya attacks (2011-08-22)
+        || (y == 2011 && m == Month::August && d == 22)
+    {
+        return true;
+    }
+
+    false
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{Calendar, Market};
+    use time::macros::date;
+
+    const CALENDAR: Calendar = Calendar::new(Market::Norway);
+
+    #[test]
+    fn test_norway_holidays_2025() {
+        assert!(CALENDAR.is_holiday(date!(2025 - 01 - 01))); // New Year
+        assert!(CALENDAR.is_holiday(date!(2025 - 04 - 17))); // Maundy Thursday
+        assert!(CALENDAR.is_holiday(date!(2025 - 04 - 18))); // Good Friday
+        assert!(CALENDAR.is_holiday(date!(2025 - 04 - 20))); // Easter Sunday
+        assert!(CALENDAR.is_holiday(date!(2025 - 04 - 21))); // Easter Monday
+        assert!(CALENDAR.is_holiday(date!(2025 - 05 - 01))); // Labour Day
+        assert!(CALENDAR.is_holiday(date!(2025 - 05 - 17))); // Constitution Day
+        assert!(CALENDAR.is_holiday(date!(2025 - 05 - 29))); // Ascension Day
+        assert!(CALENDAR.is_holiday(date!(2025 - 06 - 08))); // Whit Sunday
+        assert!(CALENDAR.is_holiday(date!(2025 - 06 - 09))); // Whit Monday
+        assert!(CALENDAR.is_holiday(date!(2025 - 12 - 25))); // Christmas
+        assert!(CALENDAR.is_holiday(date!(2025 - 12 - 26))); // Boxing Day
+    }
+
+    #[test]
+    fn test_norway_business_days_2025() {
+        assert!(!CALENDAR.is_holiday(date!(2025 - 01 - 02)));
+        assert!(!CALENDAR.is_holiday(date!(2025 - 03 - 17)));
+        assert!(!CALENDAR.is_holiday(date!(2025 - 11 - 12)));
+    }
+}