fix(theme-shared): fix date formatting for ngb datepicker

npm/ng-packs/packages/theme-shared/src/lib/utils/date-parser-formatter.ts

@@ -31,8 +31,17 @@ export class DateParserFormatter extends NgbDateParserFormatter {
         return { year: toInteger(dateParts[0]), month: null, day: null };
       } else if (dateParts.length === 2 && isNumber(dateParts[0]) && isNumber(dateParts[1])) {
         return { year: toInteger(dateParts[0]), month: toInteger(dateParts[1]), day: null };
-      } else if (dateParts.length === 3 && isNumber(dateParts[0]) && isNumber(dateParts[1]) && isNumber(dateParts[2])) {
-        return { year: toInteger(dateParts[0]), month: toInteger(dateParts[1]), day: toInteger(dateParts[2]) };
+      } else if (
+        dateParts.length === 3 &&
+        isNumber(dateParts[0]) &&
+        isNumber(dateParts[1]) &&
+        isNumber(dateParts[2])
+      ) {
+        return {
+          year: toInteger(dateParts[0]),
+          month: toInteger(dateParts[1]),
+          day: toInteger(dateParts[2]),
+        };
       }
     }
     return null;
@@ -40,7 +49,7 @@ export class DateParserFormatter extends NgbDateParserFormatter {
 
   format(date: NgbDateStruct): string {
     if (date && this.datePipe) {
-      return this.datePipe.transform(new Date(date.year, date.month, date.day), 'shortDate');
+      return this.datePipe.transform(new Date(date.year, date.month - 1, date.day), 'shortDate');
     } else {
       return date
         ? `${date.year}-${isNumber(date.month) ? padNumber(date.month) : ''}-${