Adding Inauguration Day to MXMC (#2678)

* PROD-42681: Adding Inauguration Day to MXMC

* PROD-42681: Adding Inauguration Day to MXMC

modules/basics/src/main/java/com/opengamma/strata/basics/date/GlobalHolidayCalendars.java

@@ -1169,6 +1169,7 @@ private static void addHungarianSaturdays(List<LocalDate> holidays, Set<LocalDat
   // dates of published fixings - https://twitter.com/Banxico
   // http://www.banxico.org.mx/SieInternet/consultarDirectorioInternetAction.do?accion=consultarCuadro&idCuadro=CF111&locale=en
   // http://www.gob.mx/cms/uploads/attachment/file/161094/calendario_vacaciones2016.pdf
+  // https://comunicacionsocial.diputados.gob.mx/index.php/boletines/la-camara-de-diputados-declaro-el-1-de-octubre-de-cada-seis-a-os-como-dia-de-descanso-obligatorio
   static ImmutableHolidayCalendar generateMexicoCity() {
     List<LocalDate> holidays = new ArrayList<>(2000);
     for (int year = 1950; year <= 2099; year++) {
@@ -1186,6 +1187,10 @@ static ImmutableHolidayCalendar generateMexicoCity() {
       holidays.add(date(year, 5, 1));
       // independence
       holidays.add(date(year, 9, 16));
+      // inaguration day - occurring once in every 6 years (2024, 2030, etc).
+      if (year >= 2024 && (year + 4) % 6 == 0) {
+        holidays.add(date(year, 10, 1));
+      }
       // dead
       holidays.add(date(year, 11, 2));
       // revolution
@@ -1196,7 +1201,7 @@ static ImmutableHolidayCalendar generateMexicoCity() {
       holidays.add(date(year, 12, 25));
     }
     removeSatSun(holidays);
-    return ImmutableHolidayCalendar.of(HolidayCalendarId.of("MXMC"), holidays, SATURDAY, SUNDAY);
+    return ImmutableHolidayCalendar.of(HolidayCalendarIds.MXMC, holidays, SATURDAY, SUNDAY);
   }
 
   // generate BRBD

modules/basics/src/test/java/com/opengamma/strata/basics/date/GlobalHolidayCalendarsTest.java

@@ -944,6 +944,8 @@ public static Object[][] data_mxmc() {
             md(5, 1), md(9, 16), md(11, 2), md(11, 16), md(12, 12), md(12, 25))},
         {2016, mds(2016, md(1, 1), md(2, 1), md(3, 21), md(3, 24), md(3, 25),
             md(5, 1), md(9, 16), md(11, 2), md(11, 21), md(12, 12), md(12, 25))},
+        {2024, mds(2024, md(1, 1), md(2, 5), md(3, 18), md(3, 28), md(3, 29),
+            md(5, 1), md(9, 16), md(10, 1), md(11, 2), md(11, 18), md(12, 12), md(12, 25))},
     };
   }