Choose 12/24h according to system settings

app/src/main/java/org/isoron/helpers/DateHelper.java

@@ -16,6 +16,9 @@
 
 package org.isoron.helpers;
 
+import android.content.Context;
+import android.text.format.DateFormat;
+
 import java.text.DecimalFormat;
 import java.text.SimpleDateFormat;
 import java.util.Date;
@@ -42,6 +45,17 @@ public class DateHelper
 		return getStartOfDay(DateHelper.getLocalTime());
 	}
 
+	public static String formatTime(Context context, int hours, int minutes)
+	{
+		int reminderMilliseconds = (hours * 60 + minutes) * 60 * 1000;
+
+		Date date = new Date(reminderMilliseconds);
+		java.text.DateFormat df = DateFormat.getTimeFormat(context);
+		df.setTimeZone(TimeZone.getTimeZone("UTC"));
+
+		return df.format(date);
+	}
+
 //	public static Date getStartOfDay(Date date)
 //	{
 //		Calendar calendar = Calendar.getInstance();

app/src/main/java/org/isoron/uhabits/dialogs/EditHabitFragment.java

@@ -16,18 +16,14 @@
 
 package org.isoron.uhabits.dialogs;
 
-import org.isoron.helpers.ColorHelper;
-import org.isoron.helpers.Command;
-import org.isoron.helpers.DialogHelper.OnSavedListener;
-import org.isoron.uhabits.R;
-import org.isoron.uhabits.models.Habit;
-
 import android.app.DialogFragment;
 import android.content.SharedPreferences;
 import android.graphics.Color;
 import android.graphics.ColorMatrix;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
+import android.text.format.DateFormat;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
@@ -42,6 +38,16 @@ import com.android.datetimepicker.time.RadialPickerLayout;
 import com.android.datetimepicker.time.TimePickerDialog;
 import com.android.datetimepicker.time.TimePickerDialog.OnTimeSetListener;
 
+import org.isoron.helpers.ColorHelper;
+import org.isoron.helpers.Command;
+import org.isoron.helpers.DateHelper;
+import org.isoron.helpers.DialogHelper.OnSavedListener;
+import org.isoron.uhabits.R;
+import org.isoron.uhabits.models.Habit;
+
+import java.util.Date;
+import java.util.TimeZone;
+
 public class EditHabitFragment extends DialogFragment implements OnClickListener
 {
 	private int mode;
@@ -54,6 +60,7 @@ public class EditHabitFragment extends DialogFragment implements OnClickListener
 	private TextView tvName, tvDescription, tvFreqNum, tvFreqDen, tvInputReminder;
 
 	private SharedPreferences prefs;
+	private boolean is24HourMode;
 
 	static class SolidColorMatrix extends ColorMatrix
 	{
@@ -118,6 +125,8 @@ public class EditHabitFragment extends DialogFragment implements OnClickListener
 		Bundle args = getArguments();
 		mode = (Integer) args.get("editMode");
 
+        is24HourMode = DateFormat.is24HourFormat(getContext());
+
         if(mode == CREATE_MODE)
 		{
 			getDialog().setTitle("Create habit");
@@ -184,8 +193,8 @@ public class EditHabitFragment extends DialogFragment implements OnClickListener
 		if(modified_habit.reminder_hour != null)
 		{
 			tvInputReminder.setTextColor(Color.BLACK);
-			tvInputReminder.setText(String.format("%02d:%02d", modified_habit.reminder_hour,
+			tvInputReminder.setText(DateHelper.formatTime(getActivity(),
-					modified_habit.reminder_min));
+                    modified_habit.reminder_hour, modified_habit.reminder_min));
 		}
 		else
 		{
@@ -237,7 +246,7 @@ public class EditHabitFragment extends DialogFragment implements OnClickListener
 					modified_habit.reminder_min = null;
 					updateReminder();
 				}
-			}, default_hour, default_min, true);
+			}, default_hour, default_min, is24HourMode);
 			timePicker.show(getFragmentManager(), "timePicker");
 		}