Updated Claims implementation as well as put/putAll to better handle specification dates.

impl/src/main/java/io/jsonwebtoken/impl/DefaultClaims.java

@@ -117,6 +117,15 @@ public class DefaultClaims extends JwtMap implements Claims {
             Claims.NOT_BEFORE.equals(claimName);
     }
 
+    @Override
+    public Object put(String s, Object o) {
+        if (o instanceof Date && isSpecDate(s)) { //since 0.10.0
+            Date date = (Date)o;
+            return setDateAsSeconds(s, date);
+        }
+        return super.put(s, o);
+    }
+
     @Override
     public <T> T get(String claimName, Class<T> requiredType) {
 

impl/src/main/java/io/jsonwebtoken/impl/JwtMap.java

@@ -31,12 +31,13 @@ public class JwtMap implements Map<String, Object> {
     private final Map<String, Object> map;
 
     public JwtMap() {
-        this(new LinkedHashMap<String, Object>());
+        this.map = new LinkedHashMap<>();
     }
 
     public JwtMap(Map<String, Object> map) {
+        this();
         Assert.notNull(map, "Map argument cannot be null.");
-        this.map = map;
+        putAll(map);
     }
 
     protected String getString(String name) {
@@ -118,12 +119,12 @@ public class JwtMap implements Map<String, Object> {
         }
     }
 
-    protected void setDateAsSeconds(String name, Date d) {
+    protected Object setDateAsSeconds(String name, Date d) {
         if (d == null) {
-            map.remove(name);
+            return map.remove(name);
         } else {
             long seconds = d.getTime() / 1000;
-            map.put(name, seconds);
+            return map.put(name, seconds);
         }
     }
 
@@ -173,7 +174,7 @@ public class JwtMap implements Map<String, Object> {
             return;
         }
         for (String s : m.keySet()) {
-            map.put(s, m.get(s));
+            put(s, m.get(s));
         }
     }
 

impl/src/test/groovy/io/jsonwebtoken/impl/DefaultClaimsTest.groovy

@@ -192,4 +192,93 @@ class DefaultClaimsTest {
         assertEquals(expected, claims.getNotBefore())
     }
 
+    @Test
+    void testPutWithIat() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        claims.put('iat', now) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('iat') //conversion should have happened
+    }
+
+    @Test
+    void testPutAllWithIat() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        claims.putAll([iat: now]) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('iat') //conversion should have happened
+    }
+
+    @Test
+    void testConstructorWithIat() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        this.claims = new DefaultClaims([iat: now]) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('iat') //conversion should have happened
+    }
+
+    @Test
+    void testPutWithNbf() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        claims.put('nbf', now) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('nbf') //conversion should have happened
+    }
+
+    @Test
+    void testPutAllWithNbf() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        claims.putAll([nbf: now]) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('nbf') //conversion should have happened
+    }
+
+    @Test
+    void testConstructorWithNbf() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        this.claims = new DefaultClaims([nbf: now]) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('nbf') //conversion should have happened
+    }
+
+    @Test
+    void testPutWithExp() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        claims.put('exp', now) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('exp') //conversion should have happened
+    }
+
+    @Test
+    void testPutAllWithExp() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        claims.putAll([exp: now]) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('exp') //conversion should have happened
+    }
+
+    @Test
+    void testConstructorWithExp() {
+        long millis = System.currentTimeMillis()
+        long seconds = millis / 1000 as long
+        Date now = new Date(millis)
+        this.claims = new DefaultClaims([exp: now]) //this should convert 'now' to seconds since epoch
+        assertEquals seconds, claims.get('exp') //conversion should have happened
+    }
+
+    @Test
+    void testPutWithNonSpecDate() {
+        long millis = System.currentTimeMillis()
+        Date now = new Date(millis)
+        claims.put('foo', now)
+        assertEquals now, claims.get('foo') //conversion should NOT have occurred
+    }
+
 }