1th month 2th month swipe crash on hijri and gre fixed

Author: ali77gh

app/src/main/java/com/ali/universaldatetools/MainActivity.java

@@ -26,7 +26,7 @@ protected void onCreate(Bundle savedInstanceState) {
         Button getTime = findViewById(R.id.btn_get_time);
         TextView timeView = findViewById(R.id.text_time_show);
 
-        a.ShowDatePicker(Calendar.Jalali);
+        a.ShowDatePicker(Calendar.Gregorian);
         a.setOnDateSelected((dateSystem, unixTime) -> {
             timeView.setText("unix time is: " + unixTime);
             timeView.append("\ndate is: " + dateSystem);
@@ -41,6 +41,7 @@ protected void onCreate(Bundle savedInstanceState) {
             }
         });
 
+
         lang.setOnClickListener(v -> {
             if (getString(R.string.LangId).equals("en")) {
                 setLocale("fa");

uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/DateSystem.java

@@ -4,6 +4,7 @@
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.annotation.RequiresApi;
+import android.util.Log;
 
 import com.ali.uneversaldatetools.model.DateModel;
 import com.ali.uneversaldatetools.tools.DateTools;
@@ -50,7 +51,10 @@ public DateSystem(DateModel date, Calendar calendar) {
     public DateSystem(int year, int month, int day, Calendar calendar) {
         Calendar = calendar;
 
-        if (month == 0) throw new IllegalArgumentException("month cant be 0");
+        Log.d("month: ", String.valueOf(month));
+        if (month > 12) month -= 12;
+        else if (month < 1) month += 12;
+
         switch (Calendar) {
             case Jalali: {
                 Date_SD = new JalaliDateTime(year, month, day);
@@ -68,7 +72,6 @@ public DateSystem(int year, int month, int day, Calendar calendar) {
                 throw new RuntimeException("Invalid Calendar Type!");
             }
         }
-
         Date = Date_SD.getDate();
     }