Add calendars for Iceland, India, Indonesia

src/time/calendars/denmark.rs

@@ -27,7 +27,7 @@ impl Calendar for Denmark {
     }
 
     /// Denmark holidays:
-    ///     - Maunday Thursday
+    ///     - Maundy Thursday
     ///     - Good Friday
     ///     - Easter Monday
     ///     - General Prayer Day

src/time/calendars/hungary.rs

@@ -96,8 +96,8 @@ mod test_hungary {
         let labour_day = datetime!(2024-05-01 12:00:00 UTC);
         let national_holiday = datetime!(2024-08-20 12:00:00 UTC);
         let revolution_1956_day = datetime!(2024-10-23 12:00:00 UTC);
-        let christmas = datetime!(2023-12-25 12:00:00 UTC);
-        let second_christmas_day = datetime!(2023-12-26 12:00:00 UTC);
+        let christmas = datetime!(2024-12-25 12:00:00 UTC);
+        let second_christmas_day = datetime!(2024-12-26 12:00:00 UTC);
 
         assert!(!calendar.is_business_day(new_years_day));
         assert!(!calendar.is_business_day(revolution_1848_day));

src/time/calendars/iceland.rs

@@ -10,19 +10,56 @@
 use crate::time::Calendar;
 use time::{Month, OffsetDateTime, Weekday};
 
-/// Czech Republic calendar.
-pub struct CzechRepublic;
+/// Iceland calendar.
+pub struct Iceland;
 
-impl Calendar for CzechRepublic {
+impl Calendar for Iceland {
     fn name(&self) -> &'static str {
-        ""
+        "Iceland"
+    }
+
+    fn country_code(&self) -> crate::iso::ISO_3166 {
+        crate::iso::ICELAND
+    }
+
+    fn market_identifier_code(&self) -> crate::iso::ISO_10383 {
+        crate::iso::XICE
     }
 
     fn is_business_day(&self, date: OffsetDateTime) -> bool {
         let (w, d, m, y, dd) = self.unpack_date(date);
         let em = Self::easter_monday(y as usize, false);
 
-        if Self::is_weekend(date) {
+        if Self::is_weekend(date)
+            // New Year's Day
+            || (d == 1 && m == Month::January)
+            // Maundy Thursday
+            || (dd == em - 4)
+            // Good Friday
+            || (dd == em - 3)
+            // Easter Monday
+            || (dd == em)
+            // First Day of Summer (first Thursday after 18th of April)
+            || (w == Weekday::Thursday && (19..=25).contains(&d) && m == Month::April)
+            // Labor Day
+            || (d == 1 && m == Month::May)
+            // Ascension Day
+            || (dd == em + 38)
+            // Whit Monday
+            || (dd == em + 49)
+            // Icelandic Republic Day
+            || (d == 17 && m == Month::June)
+            // Commerce Day (first Monday of August)
+            || (d <= 7 && w == Weekday::Monday && m == Month::August)
+            // Christmas Eve
+            || (d == 24 && m == Month::December)
+            // Christmas
+            || (d == 25 && m == Month::December)
+            // Boxing Day
+            || (d == 26 && m == Month::December)
+            // New Year's Eve
+            || (d == 31 && m == Month::December)
+        {
             return false;
         }
 
@@ -35,4 +72,62 @@ impl Calendar for CzechRepublic {
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 #[cfg(test)]
-mod tests {}
+mod test_iceland {
+    use super::*;
+    use time::macros::datetime;
+
+    // Test to verify the name() method.
+    #[test]
+    fn test_name() {
+        let calendar = Iceland;
+        assert_eq!(calendar.name(), "Iceland");
+    }
+
+    // Test to verify if weekends are not considered business days.
+    #[test]
+    fn test_is_weekend() {
+        let calendar = Iceland;
+        let sat = datetime!(2024-01-13 12:00:00 UTC);
+        let sun = datetime!(2024-01-14 12:00:00 UTC);
+        assert!(!calendar.is_business_day(sat));
+        assert!(!calendar.is_business_day(sun));
+    }
+
+    // Test to verify if the is_business_day() method properly accounts for public holidays.
+    #[test]
+    fn test_is_public_holiday() {
+        let calendar = Iceland;
+        let new_years_day = datetime!(2024-01-01 12:00:00 UTC);
+        let maudy_thursday = datetime!(2024-03-28 12:00:00 UTC);
+        let first_day_of_summer = datetime!(2024-04-25 12:00:00 UTC);
+        let labour_day = datetime!(2024-05-01 12:00:00 UTC);
+        let ascension_day = datetime!(2024-05-09 12:00:00 UTC);
+        let independence_day = datetime!(2024-06-17 12:00:00 UTC);
+        let commerce_day = datetime!(2024-08-05 12:00:00 UTC);
+        let christmas = datetime!(2024-12-25 12:00:00 UTC);
+        let new_years_eve = datetime!(2024-12-31 12:00:00 UTC);
+
+        assert!(!calendar.is_business_day(new_years_day));
+        assert!(!calendar.is_business_day(maudy_thursday));
+        assert!(!calendar.is_business_day(first_day_of_summer));
+        assert!(!calendar.is_business_day(labour_day));
+        assert!(!calendar.is_business_day(ascension_day));
+        assert!(!calendar.is_business_day(independence_day));
+        assert!(!calendar.is_business_day(commerce_day));
+        assert!(!calendar.is_business_day(christmas));
+        assert!(!calendar.is_business_day(new_years_eve));
+    }
+
+    // Test to verify if the is_business_day() method properly accounts for regular business days.
+    #[test]
+    fn test_is_regular_business_day() {
+        let calendar = Iceland;
+        let regular_day1 = datetime!(2024-01-17 12:00:00 UTC);
+        let regular_day2 = datetime!(2024-07-08 12:00:00 UTC);
+        let regular_day3 = datetime!(2024-11-18 12:00:00 UTC);
+
+        assert!(calendar.is_business_day(regular_day1));
+        assert!(calendar.is_business_day(regular_day2));
+        assert!(calendar.is_business_day(regular_day3));
+    }
+}