From 1e471171794ad93b1d100f2d3024ef0078a88bab Mon Sep 17 00:00:00 2001
From: Alexander Vakrilov <alexander.vakrilov@telerik.com>
Date: Tue, 26 Sep 2017 09:44:33 +0300
Subject: [PATCH] fix: DatePicker month off by 1 in Android (#4872)

---
 tests/app/ui/date-picker/date-picker-tests.ts  | 18 ++++++++++++++++++
 .../ui/date-picker/date-picker.android.ts      |  2 +-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/tests/app/ui/date-picker/date-picker-tests.ts b/tests/app/ui/date-picker/date-picker-tests.ts
index d721b94cb..4f07d03c5 100644
--- a/tests/app/ui/date-picker/date-picker-tests.ts
+++ b/tests/app/ui/date-picker/date-picker-tests.ts
@@ -99,6 +99,24 @@ export class DatePickerTest extends testModule.UITest<datePickerModule.DatePicke
         TKUnit.assertEqual(actualValue, expectedValue);
     }
 
+    public test_WhenCreated_NativeYearIsCurrentYear() {
+        const actualValue = datePickerTestsNative.getNativeYear(this.testView);
+        const expectedValue = currentDate.getFullYear();
+        TKUnit.assertEqual(actualValue, expectedValue);
+    }
+
+    public test_WhenCreated_NativeMonthIsCurrentMonth() {
+        const actualValue = datePickerTestsNative.getNativeMonth(this.testView);
+        const expectedValue = currentDate.getMonth() + 1;
+        TKUnit.assertEqual(actualValue, expectedValue);
+    }
+
+    public test_WhenCreated_NativeDayIsCurrentDay() {
+        const actualValue = datePickerTestsNative.getNativeDay(this.testView);;
+        const expectedValue = currentDate.getDate();
+        TKUnit.assertEqual(actualValue, expectedValue);
+    }
+
     public testYearFromLocalToNative() {
         const expectedValue = 1980;
         this.testView.year = expectedValue;
diff --git a/tns-core-modules/ui/date-picker/date-picker.android.ts b/tns-core-modules/ui/date-picker/date-picker.android.ts
index c85b159a6..f52954a86 100644
--- a/tns-core-modules/ui/date-picker/date-picker.android.ts
+++ b/tns-core-modules/ui/date-picker/date-picker.android.ts
@@ -59,7 +59,7 @@ export class DatePicker extends DatePickerBase {
         picker.setCalendarViewShown(false);
         const listener = new DateChangedListener(this);
 
-        picker.init(this.year, this.month, this.day, listener);
+        picker.init(this.year, this.month - 1, this.day, listener);
         (<any>picker).listener = listener;
         return picker;
     }