Added utc mode in android code

DatePickerAndroid.js

@@ -20,6 +20,7 @@ class DatePickerAndroid extends React.Component {
                 maximumDate={this._maximumDate()}
                 onChange={this._onChange}
                 style={[styles.picker, this.props.style]}
+                utc={this.props.timeZoneOffsetInMinutes !== undefined}
             />
         )
     }
@@ -36,22 +37,17 @@ class DatePickerAndroid extends React.Component {
     _date = () => this._toIsoWithTimeZoneOffset(this.props.date);
 
     _fromIsoWithTimeZoneOffset = date => {
-        if (this.props.timeZoneOffsetInMinutes === undefined) {
+        if (this.props.timeZoneOffsetInMinutes === undefined)
             return moment(date)
-        }
 
         return moment.utc(date).subtract(this.props.timeZoneOffsetInMinutes, 'minutes')
     }
     
     _toIsoWithTimeZoneOffset = date => {
-        if (!date)
-            return undefined
-        
-        if (this.props.timeZoneOffsetInMinutes === undefined) {
+        if (this.props.timeZoneOffsetInMinutes === undefined)
             return moment(date).toISOString()
-        }
 
-        return moment.utc(date).add(this.props.timeZoneOffsetInMinutes, 'minutes')
+        return moment.utc(date).add(this.props.timeZoneOffsetInMinutes, 'minutes').toISOString()
     }
 
 }

android/src/main/java/com/henninghall/date_picker/DatePickerManager.java

@@ -11,12 +11,16 @@ import net.time4j.android.ApplicationStarter;
 import org.apache.commons.lang3.LocaleUtils;
 
 import java.util.Map;
+import java.util.TimeZone;
 
 public class DatePickerManager extends SimpleViewManager<PickerView>  {
 
   public static final String REACT_CLASS = "DatePickerManager";
   public static ThemedReactContext context;
   private String date;
+  private String minimumDate;
+  private String maximumDate;
+  private boolean utc;
 
   @Override
   public String getName() {
@@ -53,12 +57,12 @@ public class DatePickerManager extends SimpleViewManager  {
 
   @ReactProp(name = "minimumDate")
   public void setMinimumDate(PickerView view, @Nullable String date) {
-    view.setMinimumDate(Utils.isoToDate(date));
+    this.minimumDate = minimumDate;
   }
 
   @ReactProp(name = "maximumDate")
   public void setMaximumDate(PickerView view, @Nullable String date) {
-    view.setMaximumDate(Utils.isoToDate(date));
+    this.maximumDate = maximumDate;
   }
 
   @ReactProp(name = "fadeToColor")
@@ -77,11 +81,24 @@ public class DatePickerManager extends SimpleViewManager  {
     view.setMinuteInterval(interval);
   }
 
+  @ReactProp(name = "utc")
+  public void setUtc(PickerView view, @Nullable boolean utc) throws Exception {
+    this.utc = utc;
+  }
+
+
+
   @Override
   protected void onAfterUpdateTransaction(PickerView view) {
     super.onAfterUpdateTransaction(view);
-      view.updateDisplayValuesIfNeeded();
-      view.setDate(Utils.isoToDate(date));
+
+    TimeZone timeZone = utc ? TimeZone.getTimeZone("UTC") : TimeZone.getDefault();
+
+    view.updateDisplayValuesIfNeeded();
+    view.setTimeZone(timeZone);
+    view.setDate(Utils.isoToCalendar(date, timeZone));
+    view.setMinimumDate(Utils.isoToCalendar(minimumDate, timeZone));
+    view.setMaximumDate(Utils.isoToCalendar(maximumDate, timeZone));
   }
 
   public Map getExportedCustomBubblingEventTypeConstants() {

android/src/main/java/com/henninghall/date_picker/PickerView.java

@@ -1,5 +1,6 @@
 package com.henninghall.date_picker;
 
+import android.os.Build;
 import android.view.View;
 import android.widget.RelativeLayout;
 
@@ -20,8 +21,6 @@ import com.henninghall.date_picker.wheels.MonthWheel;
 import com.henninghall.date_picker.wheels.Wheel;
 import com.henninghall.date_picker.wheels.YearWheel;
 
-import org.apache.commons.lang3.time.DateUtils;
-
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -31,6 +30,7 @@ import java.util.Collection;
 import java.util.Date;
 import java.util.List;
 import java.util.Locale;
+import java.util.TimeZone;
 
 import cn.carbswang.android.numberpickerview.library.NumberPickerView;
 
@@ -49,11 +49,12 @@ public class PickerView extends RelativeLayout {
     public DateWheel dateWheel;
     public MonthWheel monthWheel;
     public YearWheel yearWheel;
-    public Date maxDate;
-    public Date minDate;
+    public Calendar maxDate;
+    public Calendar minDate;
     private WheelOrderUpdater wheelOrderUpdater;
     public boolean isInitialized = false;
     public boolean requireDisplayValueUpdate = true;
+    public TimeZone timeZone;
 
 
     public PickerView() {
@@ -65,7 +66,7 @@ public class PickerView extends RelativeLayout {
         RelativeLayout wheelsWrapper = (RelativeLayout) rootView.findViewById(R.id.wheelsWrapper);
         wheelsWrapper.setWillNotDraw(false);
 
-        locale = android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP ? Locale.forLanguageTag("en") : Locale.getDefault();
+        locale = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? Locale.forLanguageTag("en") : Locale.getDefault();
 
         yearWheel = new YearWheel( this, R.id.year);
         monthWheel = new MonthWheel( this, R.id.month);
@@ -85,7 +86,10 @@ public class PickerView extends RelativeLayout {
         public void onChange(Wheel wheel) {
             WritableMap event = Arguments.createMap();
             try {
-                Date date = dateFormat.parse(getDateString());
+                dateFormat.setTimeZone(timeZone);
+                Calendar date = Calendar.getInstance(timeZone);
+                date.setTime(dateFormat.parse(getDateString()));
+
                 if (minDate != null && date.before(minDate)) applyOnVisibleWheels(new AnimateToDate(minDate));
                 else if (maxDate != null && date.after(maxDate)) applyOnVisibleWheels(new AnimateToDate(maxDate));
                 else {
@@ -123,18 +127,18 @@ public class PickerView extends RelativeLayout {
         });
     }
 
-    public void setMinimumDate(Date date) {
-        minDate = Utils.getTruncatedDateOrNull(date);
+    public void setMinimumDate(Calendar cal) {
+        minDate = Utils.getTruncatedCalendarOrNull(cal);
         requireDisplayValueUpdate = true;
     }
 
-    public void setMaximumDate(Date date) {
-        maxDate = Utils.getTruncatedDateOrNull(date);
+    public void setMaximumDate(Calendar cal) {
+        maxDate = Utils.getTruncatedCalendarOrNull(cal);
         requireDisplayValueUpdate = true;
     }
 
-    public void setDate(Date date) {
-        applyOnAllWheels(new SetDate(date));
+    public void setDate(Calendar cal) {
+        applyOnAllWheels(new SetDate(cal));
     }
 
     public void setLocale(Locale locale) {
@@ -228,4 +232,12 @@ public class PickerView extends RelativeLayout {
             requireDisplayValueUpdate = false;
         }
     }
+
+    public void setTimeZone(TimeZone timeZone) {
+        this.timeZone = timeZone;
+    }
+
+    public TimeZone getTimeZone() {
+        return timeZone;
+    }
 }

android/src/main/java/com/henninghall/date_picker/Utils.java

@@ -25,18 +25,20 @@ public class Utils {
         return UnitPatterns.of(locale).getTodayWord();
     }
 
-    public static Date isoToDate(String date)  {
-        if(date == null) return null;
+    public static Calendar isoToCalendar(String dateString, TimeZone timeZone)  {
+        if(dateString == null) return null;
         try {
-            return getIsoUTCFormat().parse(date);
+            Calendar calendar = Calendar.getInstance(timeZone);
+            calendar.setTime(getIsoUTCFormat().parse(dateString));
+            return calendar;
         } catch (ParseException e) {
             e.printStackTrace();
             return null;
         }
     }
 
-    public static String dateToIso(Date date) {
-        return getIsoUTCFormat().format(date);
+    public static String dateToIso(Calendar date) {
+        return getIsoUTCFormat().format(date.getTime());
     }
 
     public static int getWheelHeight(View pickerView) {
@@ -58,9 +60,9 @@ public class Utils {
         return DateUtils.isToday(cal.getTimeInMillis());
     }
 
-    public static Date getTruncatedDateOrNull(Date date) {
+    public static Calendar getTruncatedCalendarOrNull(Calendar cal) {
         try {
-            return org.apache.commons.lang3.time.DateUtils.truncate(date, Calendar.MINUTE);
+            return org.apache.commons.lang3.time.DateUtils.truncate(cal, Calendar.MINUTE);
         } catch (Exception e){
             return null;
         }
@@ -69,6 +71,7 @@ public class Utils {
     private static SimpleDateFormat getIsoUTCFormat(){
         SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
         format.setTimeZone(TimeZone.getTimeZone("UTC"));
+
         return format;
     }
 

android/src/main/java/com/henninghall/date_picker/wheelFunctions/AnimateToDate.java

@@ -2,13 +2,14 @@ package com.henninghall.date_picker.wheelFunctions;
 
 import com.henninghall.date_picker.wheels.Wheel;
 
+import java.util.Calendar;
 import java.util.Date;
 
 public class AnimateToDate implements WheelFunction {
 
-    private Date date;
+    private Calendar date;
 
-    public AnimateToDate(Date date) {
+    public AnimateToDate(Calendar date) {
         this.date = date;
     }
 

android/src/main/java/com/henninghall/date_picker/wheelFunctions/SetDate.java

@@ -2,13 +2,14 @@ package com.henninghall.date_picker.wheelFunctions;
 
 import com.henninghall.date_picker.wheels.Wheel;
 
+import java.util.Calendar;
 import java.util.Date;
 
 public class SetDate implements WheelFunction {
 
-    private Date date;
+    private Calendar date;
 
-    public SetDate(Date date) {
+    public SetDate(Calendar date) {
         this.date = date;
     }
 

android/src/main/java/com/henninghall/date_picker/wheels/DayWheel.java

@@ -6,6 +6,7 @@ import com.henninghall.date_picker.Utils;
 
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
+import java.util.Date;
 
 
 public class DayWheel extends Wheel {
@@ -33,22 +34,27 @@ public class DayWheel extends Wheel {
     }
 
     private Calendar getStartCal(){
-        Calendar cal = pickerView.getInitialDate();
+        Calendar cal;
         if (pickerView.minDate != null) {
-            cal.setTime(pickerView.minDate);
+            cal = (Calendar) pickerView.minDate.clone();
             resetToMidnight(cal);
+        } else {
+            cal = (Calendar) pickerView.getInitialDate().clone();
+            cal.add(Calendar.DATE, -defaultNumberOfDays / 2);
         }
-        else cal.add(Calendar.DATE, -defaultNumberOfDays / 2);
         return cal;
     }
 
     private Calendar getEndCal(){
-        Calendar cal = Calendar.getInstance();
+        Calendar cal;
         if (pickerView.maxDate != null) {
-            cal.setTime(pickerView.maxDate);
+            cal = (Calendar) pickerView.maxDate.clone();
             resetToMidnight(cal);
+        } else {
+            cal = (Calendar) pickerView.getInitialDate().clone();
+            cal.setTime(new Date());
+            cal.add(Calendar.DATE, defaultNumberOfDays / 2);
         }
-        else cal.add(Calendar.DATE, defaultNumberOfDays / 2);
         return cal;
     }
 

android/src/main/java/com/henninghall/date_picker/wheels/Wheel.java

@@ -7,6 +7,7 @@ import com.henninghall.date_picker.R;
 import org.apache.commons.lang3.LocaleUtils;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
+import java.util.Calendar;
 import java.util.Date;
 import cn.carbswang.android.numberpickerview.library.NumberPickerView;
 
@@ -49,11 +50,12 @@ public abstract class Wheel {
         this.displayValues= new ArrayList<>();
     }
 
-    public int getIndexOfDate(Date date){
-        return values.indexOf(format.format(date));
+    public int getIndexOfDate(Calendar date){
+        format.setTimeZone(pickerView.timeZone);
+        return values.indexOf(format.format(date.getTime()));
     }
 
-    public void animateToDate(Date date) {
+    public void animateToDate(Calendar date) {
         picker.smoothScrollToValue(getIndexOfDate(date));
     }
 
@@ -70,8 +72,9 @@ public abstract class Wheel {
         return values.get(index);
     }
 
-    public void setValue(Date date) {
-        this.userSetValue = format.format(date);
+    public void setValue(Calendar date) {
+        format.setTimeZone(pickerView.timeZone);
+        this.userSetValue = format.format(date.getTime());
         int index = getIndexOfDate(date);
 
         if(index > -1) {

android/src/main/java/com/henninghall/date_picker/wheels/YearWheel.java

@@ -37,18 +37,14 @@ public class YearWheel extends Wheel
         if (this.pickerView.maxDate == null) {
             return this.defaultEndYear;
         }
-        final Calendar cal = pickerView.getInitialDate();
-        cal.setTime(this.pickerView.maxDate);
-        return cal.get(Calendar.YEAR);
+        return this.pickerView.maxDate.get(Calendar.YEAR);
     }
 
     private int getStartYear() {
-        if (this.pickerView.minDate != null) {
-            final Calendar cal = pickerView.getInitialDate();
-            cal.setTime(this.pickerView.minDate);
-            return cal.get(Calendar.YEAR);
+        if (this.pickerView.minDate == null) {
+            return this.defaultStartYear;
         }
-        return this.defaultStartYear;
+        return this.pickerView.minDate.get(Calendar.YEAR);
     }
 
     @Override