Take into consideration IRNSS date.

src/main/java/org/orekit/time/AbsoluteDate.java

@@ -134,6 +134,10 @@ public class AbsoluteDate
     public static final AbsoluteDate QZSS_EPOCH =
         new AbsoluteDate(DateComponents.QZSS_EPOCH, TimeComponents.H00, TimeScalesFactory.getQZSS());
 
+    /** Reference epoch for IRNSS weeks: 1999-08-22T00:00:00 IRNSS time. */
+    public static final AbsoluteDate IRNSS_EPOCH =
+        new AbsoluteDate(DateComponents.IRNSS_EPOCH, TimeComponents.H00, TimeScalesFactory.getIRNSS());
+
     /** Reference epoch for BeiDou weeks: 2006-01-01T00:00:00 UTC. */
     public static final AbsoluteDate BEIDOU_EPOCH =
         new AbsoluteDate(DateComponents.BEIDOU_EPOCH, TimeComponents.H00, TimeScalesFactory.getBDT());

src/main/java/org/orekit/time/DateComponents.java

@@ -68,6 +68,9 @@ public class DateComponents implements Serializable, Comparable<DateComponents>
     /** Reference epoch for QZSS weeks: 1980-01-06. */
     public static final DateComponents QZSS_EPOCH;
 
+    /** Reference epoch for IRNSS weeks: 1999-08-22. */
+    public static final DateComponents IRNSS_EPOCH;
+
     /** Reference epoch for BeiDou weeks: 2006-01-01. */
     public static final DateComponents BEIDOU_EPOCH;
 
@@ -144,6 +147,7 @@ public class DateComponents implements Serializable, Comparable<DateComponents>
         GALILEO_EPOCH         = new DateComponents(1999, 8, 22);
         GPS_EPOCH             = new DateComponents(1980, 1, 6);
         QZSS_EPOCH            = new DateComponents(1980, 1, 6);
+        IRNSS_EPOCH           = new DateComponents(1999, 8, 22);
         BEIDOU_EPOCH          = new DateComponents(2006, 1, 1);
         GLONASS_EPOCH         = new DateComponents(1996, 1, 1);
         J2000_EPOCH           = new DateComponents(2000, 1, 1);

src/main/java/org/orekit/time/GNSSDate.java

@@ -204,6 +204,7 @@ public class GNSSDate implements Serializable, TimeStamped {
             case GALILEO : return TimeScalesFactory.getGST();
             case QZSS    : return TimeScalesFactory.getQZSS();
             case BEIDOU  : return TimeScalesFactory.getBDT();
+            case IRNSS   : return TimeScalesFactory.getIRNSS();
             default      : throw new OrekitException(OrekitMessages.INVALID_SATELLITE_SYSTEM, satellite);
         }
     }
@@ -219,6 +220,7 @@ public class GNSSDate implements Serializable, TimeStamped {
             case GALILEO : return AbsoluteDate.GALILEO_EPOCH;
             case QZSS    : return AbsoluteDate.QZSS_EPOCH;
             case BEIDOU  : return AbsoluteDate.BEIDOU_EPOCH;
+            case IRNSS   : return AbsoluteDate.IRNSS_EPOCH;
             default      : throw new OrekitException(OrekitMessages.INVALID_SATELLITE_SYSTEM, satellite);
         }
     }
@@ -234,6 +236,7 @@ public class GNSSDate implements Serializable, TimeStamped {
             case GALILEO : return DateComponents.GALILEO_EPOCH;
             case QZSS    : return DateComponents.QZSS_EPOCH;
             case BEIDOU  : return DateComponents.BEIDOU_EPOCH;
+            case IRNSS   : return DateComponents.IRNSS_EPOCH;
             default      : throw new OrekitException(OrekitMessages.INVALID_SATELLITE_SYSTEM, satellite);
         }
     }
@@ -294,7 +297,10 @@ public class GNSSDate implements Serializable, TimeStamped {
         QZSS(SatelliteSystem.QZSS, 1024),
 
         /** BeiDou. */
-        BEIDOU(SatelliteSystem.BEIDOU, 8192);
+        BEIDOU(SatelliteSystem.BEIDOU, 8192),
+
+        /** IRNSS. */
+        IRNSS(SatelliteSystem.IRNSS, 1024);
 
         /** Map for the number of week in one GNSS rollover cycle. */
         private static final Map<SatelliteSystem, Integer> CYCLE_MAP = new HashMap<SatelliteSystem, Integer>();

src/test/java/org/orekit/time/AbsoluteDateTest.java

@@ -52,6 +52,7 @@ public class AbsoluteDateTest {
         Assert.assertEquals(315964819000l,     AbsoluteDate.QZSS_EPOCH.toDate(tai).getTime());
         Assert.assertEquals(1136073633000l,    AbsoluteDate.BEIDOU_EPOCH.toDate(tai).getTime());
         Assert.assertEquals(820443629000l,     AbsoluteDate.GLONASS_EPOCH.toDate(tai).getTime());
+        Assert.assertEquals(935280019000l,     AbsoluteDate.IRNSS_EPOCH.toDate(tai).getTime());
         Assert.assertEquals(946728000000l,     AbsoluteDate.J2000_EPOCH.toDate(tt).getTime());
     }
 
@@ -75,6 +76,8 @@ public class AbsoluteDateTest {
                             AbsoluteDate.BEIDOU_EPOCH.toString(TimeScalesFactory.getUTC()));
         Assert.assertEquals("1995-12-31T21:00:00.000",
                             AbsoluteDate.GLONASS_EPOCH.toString(TimeScalesFactory.getUTC()));
+        Assert.assertEquals("1999-08-21T23:59:47.000",
+                AbsoluteDate.IRNSS_EPOCH.toString(TimeScalesFactory.getUTC()));
         Assert.assertEquals("2000-01-01T12:00:00.000",
                      AbsoluteDate.J2000_EPOCH.toString(TimeScalesFactory.getTT()));
         Assert.assertEquals("1970-01-01T00:00:00.000",

src/test/java/org/orekit/time/GNSSDateTest.java

@@ -60,6 +60,13 @@ public class GNSSDateTest {
         doTestFromWeekAndMilli(SatelliteSystem.BEIDOU, date, time, 216, 515713000.0);
     }
 
+    @Test
+    public void testFromWeekAndMilliIRNSS() {
+        final DateComponents date = new DateComponents(2006, 8, 9);
+        final TimeComponents time = new TimeComponents(16, 31, 3.0);
+        doTestFromWeekAndMilli(SatelliteSystem.IRNSS, date, time, 363, 318677000.0);
+    }
+
     private void doTestFromWeekAndMilli(final SatelliteSystem system,
                                         final DateComponents date, final TimeComponents time,
                                         final int refWeek, final double refMilliSeconds) {
@@ -98,6 +105,13 @@ public class GNSSDateTest {
         doTestFromAbsoluteDate(SatelliteSystem.BEIDOU, date, time, 216, 515713000.0);
     }
 
+    @Test
+    public void testFromAbsoluteDateIRNSS() {
+        final DateComponents date = new DateComponents(2006, 8, 9);
+        final TimeComponents time = new TimeComponents(16, 31, 3.0);
+        doTestFromAbsoluteDate(SatelliteSystem.IRNSS, date, time, 363, 318677000.0);
+    }
+
     private void doTestFromAbsoluteDate(final SatelliteSystem system,
                                         final DateComponents date, final TimeComponents time,
                                         final int refWeek, final double refMilliSeconds) {
@@ -126,6 +140,11 @@ public class GNSSDateTest {
         doTestZero(SatelliteSystem.BEIDOU);
     }
 
+    @Test
+    public void testZeroIRNSS() {
+        doTestZero(SatelliteSystem.IRNSS);
+    }
+
     private void doTestZero(final SatelliteSystem system) {
         AbsoluteDate epoch = null;
         switch (system) {
@@ -141,6 +160,9 @@ public class GNSSDateTest {
             case BEIDOU:
                 epoch = AbsoluteDate.BEIDOU_EPOCH;
                 break;
+            case IRNSS:
+                epoch = AbsoluteDate.IRNSS_EPOCH;
+                break;
             default:
                 break;
         }
@@ -189,6 +211,16 @@ public class GNSSDateTest {
         Assert.assertEquals(8192, date2.getWeekNumber());
     }
 
+    @Test
+    public void testZeroZeroIRNSS() {
+        GNSSDate.setRolloverReference(new DateComponents(DateComponents.IRNSS_EPOCH, 7 * 512));
+        GNSSDate date1 = new GNSSDate(0, 0.0, SatelliteSystem.IRNSS);
+        Assert.assertEquals(0.0, date1.getDate().durationFrom(AbsoluteDate.IRNSS_EPOCH), 1.0e-15);
+        GNSSDate.setRolloverReference(new DateComponents(GNSSDate.getRolloverReference(), 1));
+        GNSSDate date2 = new GNSSDate(0, 0.0, SatelliteSystem.IRNSS);
+        Assert.assertEquals(1024, date2.getWeekNumber());
+    }
+
     @Test
     public void testSerializationGPS() throws ClassNotFoundException, IOException {
         final DateComponents date = new DateComponents(2006, 8, 9);
@@ -217,6 +249,13 @@ public class GNSSDateTest {
         doTestSerialization(SatelliteSystem.BEIDOU, date, time, 216, 515713000.0);
     }
 
+    @Test
+    public void testSerializationIRNSS() throws ClassNotFoundException, IOException {
+        final DateComponents date = new DateComponents(2006, 8, 9);
+        final TimeComponents time = new TimeComponents(16, 31, 3.0);
+        doTestSerialization(SatelliteSystem.IRNSS, date, time, 363, 318677000.0);
+    }
+
     @Test
     public void testDefaultRolloverReference() {
         Assert.assertNull(GNSSDate.getRolloverReference());