fix(moment-jalaali): setMonth behavior (#661)

* Fixed set month

Modified setMonth method to works with jalali month value

* chore: Change test name

---------

Co-authored-by: Soheil Hasankhani <soheil.hasankhani@pishtazan.onmicrosoft.com>
Co-authored-by: Dmitriy Kovalenko <dmtr.kovalenko@outlook.com>

__tests__/jalaali.test.ts

@@ -227,6 +227,12 @@ describe("Jalaali", () => {
     expect(yearRange).toHaveLength(4);
   });
 
+  it("Jalaali -- setMonth", () => {
+    const date = jalaaliUtils.date(TEST_TIMESTAMP);
+    const newDate = jalaaliUtils.setMonth(date, 0);
+    expect(jalaaliUtils.getMonth(newDate)).toBe(0);
+  });
+
   test.each`
     format                   | expected
     ${"keyboardDate"}        | ${"۱۳۹۸/۱۰/۱۱"}

packages/jalaali/src/jalaali-utils.ts

@@ -107,6 +107,10 @@ export default class MomentUtils extends DefaultMomentUtils {
     return date.jMonth();
   };
 
+  public setMonth = (date: Moment, month: number) => {
+    return date.clone().jMonth(month);
+  };
+
   public getDaysInMonth = (date: Moment) => {
     return date.daysInMonth();
   };