From 5548bf13796fe08b32ebf95ed4c47382382ab721 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Tue, 12 Feb 2013 21:11:16 +1300
Subject: Improve timezone handling

---
 .../traccar/protocol/Gps103ProtocolDecoder.java    | 26 +++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

(limited to 'src/org/traccar')

diff --git a/src/org/traccar/protocol/Gps103ProtocolDecoder.java b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
index e79ae109f..8980c702f 100644
--- a/src/org/traccar/protocol/Gps103ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Gps103ProtocolDecoder.java
@@ -45,10 +45,11 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
             "imei:" +
             "(\\d+)," +                         // IMEI
             "([^,]+)," +                        // Alarm
-            "(\\d{2})(\\d{2})(\\d{2})\\d+," +   // Date
+            "(\\d{2})(\\d{2})(\\d{2})" +        // Local Date
+            "(\\d{2})(\\d{2})," +               // Local Time
             "[^,]*," +
             "[FL]," +                           // F - full / L - low
-            "(\\d{2})(\\d{2})(\\d{2})\\.(\\d{3})," + // Time (HHMMSS.SSS)
+            "(\\d{2})(\\d{2})(\\d{2})\\.(\\d{3})," + // Time UTC (HHMMSS.SSS)
             "([AV])," +                         // Validity
             "(\\d{2})(\\d{2}\\.\\d{4})," +      // Latitude (DDMM.MMMM)
             "([NS])," +
@@ -106,19 +107,34 @@ public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
         extendedInfo.append("<alarm>");
         extendedInfo.append(parser.group(index++));
         extendedInfo.append("</alarm>");
-
+        
         // Date
         Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
         time.clear();
         time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));
         time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
         time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
+        
+        int localHours = Integer.valueOf(parser.group(index++));
+        int localMinutes = Integer.valueOf(parser.group(index++));
+        
+        int utcHours = Integer.valueOf(parser.group(index++));
+        int utcMinutes = Integer.valueOf(parser.group(index++));
 
         // Time
-        time.set(Calendar.HOUR, Integer.valueOf(parser.group(index++)));
-        time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
+        time.set(Calendar.HOUR, localHours);
+        time.set(Calendar.MINUTE, localMinutes);
         time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
         time.set(Calendar.MILLISECOND, Integer.valueOf(parser.group(index++)));
+        
+        // Timezone calculation
+        int deltaMinutes = (localHours - utcHours) * 60 + localMinutes - utcMinutes;
+        if (deltaMinutes <= -12 * 60) {
+            deltaMinutes += 24 * 60;
+        } else if (deltaMinutes > 12) {
+            deltaMinutes -= 24 * 60;
+        }
+        time.add(Calendar.MINUTE, deltaMinutes);
         position.setTime(time.getTime());
 
         // Validity
-- 
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