feat: Add Turkey calendar (Fixed holidays)

crates/RustQuant_time/src/calendar.rs

@@ -87,6 +87,8 @@ pub enum Market {
     UnitedStates,
     /// Switzerland national calendar.
     Switzerland,
+    /// Turkey national calendar.
+    Turkey,
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     // MARKETS / EXCHANGES
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -435,6 +437,7 @@ impl Calendar {
                 Market::UnitedKingdom => is_holiday_impl_united_kingdom(date),
                 Market::UnitedStates => is_holiday_impl_united_states(date),
                 Market::Switzerland => is_holiday_impl_switzerland(date),
+                Market::Turkey => is_holiday_impl_turkey(date),
                 // Special case markets:
                 Market::None => false,
                 Market::Weekends => false,

crates/RustQuant_time/src/countries/mod.rs

@@ -116,3 +116,7 @@ pub(crate) use united_states::*;
 /// Switzerland holidays and calendars.
 pub mod switzerland;
 pub(crate) use switzerland::*;
+
+/// Turkey holidays and calendars.
+pub mod turkey;
+pub use turkey::*;

crates/RustQuant_time/src/countries/turkey.rs

@@ -0,0 +1,41 @@
+use crate::utilities::unpack_date;
+use time::{Date, Month};
+
+/// Turkey calendar.
+pub fn is_holiday_impl_turkey(date: Date) -> bool {
+    let (_y, m, d, _wd, _yd, _em) = unpack_date(date, false);
+
+    // Borsa Istanbul (BIST) Holiday Calendar
+    // Source: Official Public Holidays in Turkey
+
+    // Fixed Public Holidays (Gregorian Calendar)
+    if (d == 1 && m == Month::January)                  // New Year's Day
+        || (d == 23 && m == Month::April)               // National Sovereignty and Children's Day
+        || (d == 1 && m == Month::May)                  // Labor and Solidarity Day
+        || (d == 19 && m == Month::May)                 // Commemoration of Atatürk, Youth and Sports Day
+        || (d == 15 && m == Month::July)                // Democracy and National Unity Day
+        || (d == 30 && m == Month::August)              // Victory Day
+        || (d == 29 && m == Month::October)
+    // Republic Day
+    {
+        return true;
+    }
+
+    false
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use time::macros::date;
+
+    #[test]
+    fn test_turkey_holidays() {
+        // Republic Day
+        assert!(is_holiday_impl_turkey(date!(2024 - 10 - 29)));
+        // Victory Day
+        assert!(is_holiday_impl_turkey(date!(2024 - 08 - 30)));
+        // Regular business day
+        assert!(!is_holiday_impl_turkey(date!(2024 - 01 - 02)));
+    }
+}