Fix calculation of Sunrise and Sunset times

Fixed the Sunrise/Sunset time calculation by:

- Inverting signal of timezone offset when calling SunriseSunset's
  constructor in DayNightHelper
- Properly formating the timezone offset when parsing the times in
  SunriseSunset's calculations

DataExtractionOSM/src/net/osmand/SunriseSunset.java

@@ -174,6 +174,8 @@ package net.osmand;
 // Import required classes and packages
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.text.NumberFormat;
+import java.text.DecimalFormat;
 import java.util.Date;
 import java.util.TimeZone;
 
@@ -602,6 +604,15 @@ public class SunriseSunset
 	
 			// Load dateSunrise with data
 			dfmtDateTime = new SimpleDateFormat( "d M yyyy HH:mm z" );
+
+			// Timezone signal is reversed in SunriseSunset class
+			String tz_signal = origTimeZone <= 0?"+":"-";
+			double abs_tz = Math.abs(origTimeZone);
+			NumberFormat formatter = new DecimalFormat("00");
+
+			String tz_offset_hours = formatter.format((int)abs_tz);
+			String tz_offset_minutes = formatter.format((int)(60 * (abs_tz - (int)abs_tz)));
+
 			if( bSunriseToday )
 			{
 				dateSunrise = dfmtDateTime.parse( iDay 
@@ -609,7 +620,9 @@ public class SunriseSunset
 										+ " " + iYear 
 										+ " " + (int)dfHourRise
 										+ ":" + (int)dfMinRise 
-										+ " GMT+"+origTimeZone );
+										+ " GMT"
+									    + tz_signal + tz_offset_hours
+										+":" + tz_offset_minutes );
 			}
 		
 			// Load dateSunset with data
@@ -620,7 +633,9 @@ public class SunriseSunset
 										+ " " + iYear 
 										+ " " + (int)dfHourSet
 										+ ":" + (int)dfMinSet 
-										+ " GMT+"+origTimeZone );
+										+ " GMT"
+									    + tz_signal + tz_offset_hours
+										+":" + tz_offset_minutes );
 			}
 		} // end of try
 

OsmAnd/src/net/osmand/plus/activities/DayNightHelper.java

@@ -86,8 +86,9 @@ public class DayNightHelper implements SensorEventListener {
 					}
 					double longitude = lastKnownLocation.getLongitude();
 					Date actualTime = new Date();
-					SunriseSunset daynightSwitch = new SunriseSunset(lastKnownLocation.getLatitude(), longitude < 0 ? 360 - longitude
-							: longitude, actualTime, TimeZone.getDefault().getOffset(actualTime.getTime()) / 3600000);
+					SunriseSunset daynightSwitch = new SunriseSunset(lastKnownLocation.getLatitude(),
+																	 longitude < 0 ? 360 - longitude : longitude, actualTime,
+																	 (-1.0 * TimeZone.getDefault().getOffset(actualTime.getTime())) / 3600000);
 					boolean daytime = daynightSwitch.isDaytime();
 					log.debug("Sunrise/sunset setting to day: " + daytime); //$NON-NLS-1$
 					lastAutoValue = Boolean.valueOf(daytime);