Fix: (en) Recognize "of" between month name and year

Author: Wanasit Tanakitrungruang

src/locales/en/parsers/ENMonthNameParser.ts

@@ -10,7 +10,7 @@ const PATTERN = new RegExp(
         `(${matchAnyPattern(MONTH_DICTIONARY)})` +
         `\\s*` +
         `(?:` +
-        `[,-]?\\s*(${YEAR_PATTERN})?` +
+        `(?:,|-|of)?\\s*(${YEAR_PATTERN})?` +
         ")?" +
         "(?=[^\\s\\w]|\\s+[^0-9]|\\s+$|$)",
     "i"

test/en/en_month.test.ts

@@ -69,6 +69,14 @@ test("Test - Month-Year expression", function () {
         expect(result.start).toBeDate(new Date(2012, 9 - 1, 1, 12));
     });
 
+    testSingleCase(chrono, "in June of 2022", (result) => {
+        expect(result.text).toContain("June of 2022");
+
+        expect(result.start).not.toBeNull();
+        expect(result.start.get("year")).toBe(2022);
+        expect(result.start.get("month")).toBe(6);
+    });
+
     testSingleCase(chrono, "Statement of comprehensive income for the year ended Dec. 2021", (result) => {
         expect(result.text).toBe("Dec. 2021");