diff --git a/app/src/main/java/com/ali/universaldatetools/MainActivity.java b/app/src/main/java/com/ali/universaldatetools/MainActivity.java
index a7faff5..286f992 100755
--- a/app/src/main/java/com/ali/universaldatetools/MainActivity.java
+++ b/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(getSupportFragmentManager(), Calendar.Hijri);
+        a.ShowDatePicker(getSupportFragmentManager(), Calendar.Jalali);
         a.setOnDateSelected((dateSystem, unixTime) -> {
             timeView.setText("unix time is: " + unixTime);
             timeView.append("\ndate is: " + dateSystem);
diff --git a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/DateSystem.java b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/DateSystem.java
index fb59d91..a8a81eb 100755
--- a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/DateSystem.java
+++ b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/DateSystem.java
@@ -6,70 +6,96 @@
 import android.util.Log;
 
 import com.ali.uneversaldatetools.model.DateModel;
-import com.ali.uneversaldatetools.tools.DateTools;
+import com.ali.uneversaldatetools.tools.UnixTimeTools;
 
 import java.util.Date;
 import java.util.Objects;
+import java.util.TimeZone;
 
 /**
  * Created by ali on 9/5/18.
  */
 
-//this is struct
 public class DateSystem implements IDate {
 
     private Calendar Calendar;
     private DateModel Date;
     private IDate Date_SD;
 
-    public DateSystem(DateModel date, Calendar calendar) {
+    public DateSystem(int year, int month, int day, Calendar calendar) {
         Calendar = calendar;
 
-        if (date.month == 0) throw new IllegalArgumentException("month cant be 0");
+        Log.d("month: ", String.valueOf(month));
+        if (month > 12) month -= 12;
+
         switch (Calendar) {
-            case Jalali: {
-                Date_SD = new JalaliDateTime(date.year, date.month, date.day, date.hour, date.min, date.sec, TimeZoneHelper.getSystemTimeZone());
+
+            case Jalali:
+                Date_SD = new JalaliDateTime(year, month, day);
                 break;
-            }
-            case Gregorian: {
-                Date_SD = new GregorianDateTime(date.year, date.month, date.day, date.hour, date.min, date.sec, TimeZoneHelper.getSystemTimeZone());
+
+            case Gregorian:
+                Date_SD = new GregorianDateTime(year, month, day);
                 break;
-            }
-            case Hijri: {
-                Date_SD = new HijriDateTime(date.year, date.month, date.day, date.hour, date.min, date.sec, TimeZoneHelper.getSystemTimeZone());
+
+            case Hijri:
+                Date_SD = new HijriDateTime(year, month, day);
                 break;
-            }
-            default: {
+
+            default:
                 throw new RuntimeException("Invalid Calendar Type!");
-            }
-        }
 
-        Date = date;
+        }
+        Date = Date_SD.getDate();
     }
 
-    public DateSystem(int year, int month, int day, Calendar calendar) {
+    public DateSystem(int year, int month, int day, int hour, int min, int sec, TimeZone timeZone, Calendar calendar) {
         Calendar = calendar;
 
         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);
+
+            case Jalali:
+                Date_SD = new JalaliDateTime(year, month, day, hour, min, sec, timeZone);
                 break;
-            }
-            case Gregorian: {
-                Date_SD = new GregorianDateTime(year, month, day);
+
+            case Gregorian:
+                Date_SD = new GregorianDateTime(year, month, day, hour, min, sec, timeZone);
                 break;
-            }
-            case Hijri: {
-                Date_SD = new HijriDateTime(year, month, day);
+
+            case Hijri:
+                Date_SD = new HijriDateTime(year, month, day, hour, min, sec, timeZone);
                 break;
-            }
-            default: {
+
+            default:
                 throw new RuntimeException("Invalid Calendar Type!");
-            }
+
+        }
+        Date = Date_SD.getDate();
+    }
+
+    public DateSystem(int unixTime, TimeZone timeZone, Calendar calendar) {
+        Calendar = calendar;
+
+        switch (Calendar) {
+
+            case Jalali:
+                Date_SD = new JalaliDateTime(unixTime, timeZone);
+                break;
+
+            case Gregorian:
+                Date_SD = new GregorianDateTime(unixTime, timeZone);
+                break;
+
+            case Hijri:
+                Date_SD = new HijriDateTime(unixTime, timeZone);
+                break;
+
+            default:
+                throw new RuntimeException("Invalid Calendar Type!");
+
         }
         Date = Date_SD.getDate();
     }
@@ -189,20 +215,23 @@ public DateModel AddDays(int days) {
         return Date_SD.AddDays(days);
     }
 
-    public static DateSystem Now(Calendar calendar) {
-        return new DateSystem(DateTools.getCurrentDate(), calendar);
+    public static DateSystem Now(TimeZone timeZone, Calendar calendar) {
+        return new DateSystem(UnixTimeTools.getCurrentUnixTime(), timeZone, calendar);
     }
 
     public static DateSystem Parse(String date, Calendar calendar) {
         switch (calendar) {
             case Jalali: {
-                return new DateSystem(JalaliDateTime.Parse(date).getDate(), calendar);
+                DateModel d = JalaliDateTime.Parse(date).getDate();
+                return new DateSystem(d.year, d.month, d.day, d.hour, d.min, d.sec, TimeZoneHelper.getSystemTimeZone(), calendar);
             }
             case Gregorian: {
-                return new DateSystem(GregorianDateTime.Parse(date).getDate(), calendar);
+                DateModel d = GregorianDateTime.Parse(date).getDate();
+                return new DateSystem(d.year, d.month, d.day, d.hour, d.min, d.sec, TimeZoneHelper.getSystemTimeZone(), calendar);
             }
             case Hijri: {
-                return new DateSystem(HijriDateTime.Parse(date).getDate(), calendar);
+                DateModel d = HijriDateTime.Parse(date).getDate();
+                return new DateSystem(d.year, d.month, d.day, d.hour, d.min, d.sec, TimeZoneHelper.getSystemTimeZone(), calendar);
             }
             default: {
                 throw new RuntimeException("Invalid Calendar Type!");
@@ -213,13 +242,16 @@ public static DateSystem Parse(String date, Calendar calendar) {
     public static DateSystem Parse(String yearMonth, int day, Calendar calendar) {
         switch (calendar) {
             case Jalali: {
-                return new DateSystem(JalaliDateTime.Parse(yearMonth, day).getDate(), calendar);
+                DateModel d = JalaliDateTime.Parse(yearMonth, day).getDate();
+                return new DateSystem(d.year, d.month, d.day, d.hour, d.min, d.sec, TimeZoneHelper.getSystemTimeZone(), calendar);
             }
             case Gregorian: {
-                return new DateSystem(GregorianDateTime.Parse(yearMonth, day).getDate(), calendar);
+                DateModel d = GregorianDateTime.Parse(yearMonth, day).getDate();
+                return new DateSystem(d.year, d.month, d.day, d.hour, d.min, d.sec, TimeZoneHelper.getSystemTimeZone(), calendar);
             }
             case Hijri: {
-                return new DateSystem(HijriDateTime.Parse(yearMonth, day).getDate(), calendar);
+                DateModel d = HijriDateTime.Parse(yearMonth, day).getDate();
+                return new DateSystem(d.year, d.month, d.day, d.hour, d.min, d.sec, TimeZoneHelper.getSystemTimeZone(), calendar);
             }
             default: {
                 throw new RuntimeException("Invalid Calendar Type!");
diff --git a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/GregorianDateTime.java b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/GregorianDateTime.java
index 714c6b2..d0ee293 100755
--- a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/GregorianDateTime.java
+++ b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/GregorianDateTime.java
@@ -3,7 +3,7 @@
 import android.support.annotation.NonNull;
 
 import com.ali.uneversaldatetools.model.DateModel;
-import com.ali.uneversaldatetools.tools.DateTools;
+import com.ali.uneversaldatetools.tools.UnixTimeTools;
 
 import java.util.TimeZone;
 
@@ -21,7 +21,7 @@ public class GregorianDateTime implements IDate, Comparable<GregorianDateTime> {
     private int Sec;
     private TimeZone TimeZone;
 
-    public static final int[] DaysInMonth = {
+    static final int[] DaysInMonth = {
             0,
             31,
             29,
@@ -105,8 +105,7 @@ public static GregorianDateTime ParseYearMonth(String s) {
     }
 
     public static GregorianDateTime Now() {
-        DateModel crnt = DateTools.getCurrentDate();
-        return new GregorianDateTime(crnt.year, crnt.month, crnt.day, crnt.hour, crnt.min, crnt.sec, TimeZoneHelper.getSystemTimeZone());
+        return new GregorianDateTime(UnixTimeTools.getCurrentUnixTime(), TimeZoneHelper.getSystemTimeZone());
     }
 
 
diff --git a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/HijriDateTime.java b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/HijriDateTime.java
index 57f86d3..58390d4 100755
--- a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/HijriDateTime.java
+++ b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/HijriDateTime.java
@@ -3,7 +3,7 @@
 import android.support.annotation.NonNull;
 
 import com.ali.uneversaldatetools.model.DateModel;
-import com.ali.uneversaldatetools.tools.DateTools;
+import com.ali.uneversaldatetools.tools.UnixTimeTools;
 
 import java.util.TimeZone;
 
@@ -21,7 +21,7 @@ public class HijriDateTime implements IDate, Comparable<HijriDateTime> {
     private int Sec;
     private TimeZone TimeZone;
 
-    public static final int[] DaysInMonth = {
+    static final int[] DaysInMonth = {
             0,
             30,
             29,
@@ -105,8 +105,7 @@ public static HijriDateTime ParseYearMonth(String yearMonth) {
     }
 
     public static HijriDateTime Now() {
-        DateModel d = DateTools.getCurrentDate();
-        return new HijriDateTime(d.year, d.month, d.day, d.hour, d.min, d.sec, TimeZoneHelper.getSystemTimeZone());
+        return new HijriDateTime(UnixTimeTools.getCurrentUnixTime(), TimeZoneHelper.getSystemTimeZone());
     }
 
     public DateModel getDate() {
diff --git a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/JalaliDateTime.java b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/JalaliDateTime.java
index a719ea7..10b4bb4 100755
--- a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/JalaliDateTime.java
+++ b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/date/JalaliDateTime.java
@@ -3,7 +3,7 @@
 import android.support.annotation.NonNull;
 
 import com.ali.uneversaldatetools.model.DateModel;
-import com.ali.uneversaldatetools.tools.DateTools;
+import com.ali.uneversaldatetools.tools.UnixTimeTools;
 
 import java.util.TimeZone;
 
@@ -21,7 +21,7 @@ public class JalaliDateTime implements IDate, Comparable<JalaliDateTime> {
     private int Sec;
     private TimeZone TimeZone;
 
-    public static final int[] DaysInMonth = {
+    static final int[] DaysInMonth = {
             0,
             31,
             31,
@@ -110,9 +110,7 @@ public static JalaliDateTime ParseYearMonth(String s) {
     }
 
     public static JalaliDateTime Now() {
-        DateModel crnt = DateTools.getCurrentDate();
-        DateConverter.GregorianToJalali(crnt.year, crnt.month, crnt.day);
-        return new JalaliDateTime(crnt.year, crnt.month, crnt.day, crnt.hour, crnt.min, crnt.sec, TimeZoneHelper.getSystemTimeZone());
+        return new JalaliDateTime(UnixTimeTools.getCurrentUnixTime(), TimeZoneHelper.getSystemTimeZone());
     }
 
     public DateModel getDate() {
diff --git a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/datePicker/UDatePicker.java b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/datePicker/UDatePicker.java
index c504993..10fb450 100755
--- a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/datePicker/UDatePicker.java
+++ b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/datePicker/UDatePicker.java
@@ -21,11 +21,12 @@
 import com.ali.uneversaldatetools.R;
 import com.ali.uneversaldatetools.date.Calendar;
 import com.ali.uneversaldatetools.date.DateSystem;
+import com.ali.uneversaldatetools.date.TimeZoneHelper;
 import com.ali.uneversaldatetools.model.Month;
 import com.ali.uneversaldatetools.tools.Convert;
-import com.ali.uneversaldatetools.tools.DateTools;
 import com.ali.uneversaldatetools.tools.ExpandAndCollapseAnimation;
 import com.ali.uneversaldatetools.tools.StringGenerator;
+import com.ali.uneversaldatetools.tools.UnixTimeTools;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -88,7 +89,7 @@ public void ShowDatePicker(FragmentManager appCompatActivity, @NonNull DateSyste
     }
 
     public void ShowDatePicker(FragmentManager appCompatActivity, Calendar calendar) {
-        DateSystem defaultDate = new DateSystem(DateTools.getCurrentDate(), calendar); // now
+        DateSystem defaultDate = new DateSystem(UnixTimeTools.getCurrentUnixTime(), TimeZoneHelper.getSystemTimeZone(), calendar); // now
         ShowDatePicker(appCompatActivity, defaultDate);
     }
 
@@ -378,12 +379,12 @@ public int selectedDayProvider() {
 
     @Override
     public int currentMonthProvider() {
-        return new DateSystem(DateTools.getCurrentDate(), mDateSystem.getCalendar()).getMonth();
+        return new DateSystem(UnixTimeTools.getCurrentUnixTime(), TimeZoneHelper.getSystemTimeZone(), mDateSystem.getCalendar()).getMonth();
     }
 
     @Override
     public int currentDayProvider() {
-        return new DateSystem(DateTools.getCurrentDate(), mDateSystem.getCalendar()).getDay();
+        return new DateSystem(UnixTimeTools.getCurrentUnixTime(), TimeZoneHelper.getSystemTimeZone(), mDateSystem.getCalendar()).getDay();
     }
 
 
diff --git a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/tools/DateTools.java b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/tools/DateTools.java
deleted file mode 100755
index 3bb410c..0000000
--- a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/tools/DateTools.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.ali.uneversaldatetools.tools;
-
-import com.ali.uneversaldatetools.model.DateModel;
-
-import java.util.Date;
-
-/**
- * Created by ali on 9/11/18.
- */
-
-public class DateTools {
-
-    public static DateModel getCurrentDate() {
-        Date date = new Date();
-        date.setYear(date.getYear() + 1900);
-        date.setMonth(date.getMonth() + 1);  // change index to 1
-        return new DateModel(date.getYear(), date.getMonth(), date.getDate());
-    }
-
-    public static int getCurrentUnixTime() {
-        return (int) (System.currentTimeMillis() / 1000L);
-    }
-}
diff --git a/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/tools/UnixTimeTools.java b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/tools/UnixTimeTools.java
new file mode 100755
index 0000000..b2ba7a9
--- /dev/null
+++ b/uneversaldatetools/src/main/java/com/ali/uneversaldatetools/tools/UnixTimeTools.java
@@ -0,0 +1,12 @@
+package com.ali.uneversaldatetools.tools;
+
+/**
+ * Created by ali on 9/11/18.
+ */
+
+public class UnixTimeTools {
+
+    public static int getCurrentUnixTime() {
+        return (int) (System.currentTimeMillis() / 1000L); //toSec
+    }
+}
diff --git a/uneversaldatetools/src/test/java/com/ali/uneversaldatetools/ExampleUnitTest.java b/uneversaldatetools/src/test/java/com/ali/uneversaldatetools/ExampleUnitTest.java
index 2523441..c441ab4 100755
--- a/uneversaldatetools/src/test/java/com/ali/uneversaldatetools/ExampleUnitTest.java
+++ b/uneversaldatetools/src/test/java/com/ali/uneversaldatetools/ExampleUnitTest.java
@@ -6,7 +6,7 @@
 import com.ali.uneversaldatetools.date.JalaliDateTime;
 import com.ali.uneversaldatetools.date.TimeZoneHelper;
 import com.ali.uneversaldatetools.model.DateModel;
-import com.ali.uneversaldatetools.tools.DateTools;
+import com.ali.uneversaldatetools.tools.UnixTimeTools;
 
 import org.junit.Assert;
 import org.junit.Test;
@@ -37,7 +37,7 @@ public void ToStringTest() {
 
     @Test
     public void UnixTest() {
-        int unixTime = DateTools.getCurrentUnixTime();
+        int unixTime = UnixTimeTools.getCurrentUnixTime();
 
         Log(unixTime);
         DateModel dateModel = DateConverter.UnixToJalali(unixTime);