From a979a3a2c41ef3fe19ec154616460c755ed04a10 Mon Sep 17 00:00:00 2001
From: Stanley Huang <stanleyhuangyc@gmail.com>
Date: Thu, 1 Oct 2015 13:04:15 +1000
Subject: Add GPS date validation

---
 megalogger/megalogger.ino | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/megalogger/megalogger.ino b/megalogger/megalogger.ino
index 3d8f326..03cc2a9 100644
--- a/megalogger/megalogger.ino
+++ b/megalogger/megalogger.ino
@@ -56,7 +56,7 @@ static uint32_t startTime = 0;
 static uint16_t lastSpeed = 0;
 static uint32_t lastSpeedTime = 0;
 static int gpsSpeed = -1;
-static uint16_t gpsDate = 0;
+static uint32_t gpsDate = 0;
 static uint32_t obdTime = 0;
 static uint8_t obdCount = 0;
 
@@ -378,10 +378,13 @@ void processGPS()
     logger.dataTime = millis();
 
     gps.get_datetime(&date, &time, 0);
-    if ((uint16_t)date != gpsDate) {
-        // log date only if it's changed
-        logger.logData(PID_GPS_DATE, (int32_t)date);
-        gpsDate = (uint16_t)date;
+    if (date != gpsDate) {
+        // log date only if it's changed and valid
+        int year = date % 100;
+        if (date < 1000000 && date >= 10000 && year >= 15 && (gpsDate == 0 || year - (gpsDate % 100) <= 1)) {
+          logger.logData(PID_GPS_DATE, (int32_t)date);
+          gpsDate = date;
+        }
     }
     logger.logData(PID_GPS_TIME, (int32_t)time);
 
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