support appending time_t to BSONObjBuilder

db/jsobj.h

@@ -1196,6 +1196,15 @@ namespace mongo {
         void append( const char *fieldName, OID oid ) {
             appendOID( fieldName, &oid );
         }
+        /** Append a time_t date.
+            @param dt a C-style 32 bit date value, that is
+                      the number of seconds since January 1, 1970, 00:00:00 GMT
+        */
+        void append(const char *fieldName, time_t dt) {
+            b.append((char) Date);
+            b.append(fieldName);
+            b.append(static_cast<unsigned long long>(dt) * 1000);
+        }
         /** Append a date.  
             @param dt a Java-style 64 bit date value, that is 
                       the number of milliseconds since January 1, 1970, 00:00:00 GMT

dbtests/jsobjtests.cpp

@@ -724,6 +724,24 @@ namespace JsobjTests {
         }
     };
 
+    class TimeTBuilder {
+    public:
+        void run() {
+            unsigned long long before = jsTime();
+            time_t now = time(NULL);
+            BSONObj o = BSON("now" << now);
+            unsigned long long after = jsTime();
+
+
+            ASSERT( o.valid() );
+
+            BSONElement e = o["now"];
+            ASSERT( e.type() == Date );
+            ASSERT( e.date()/1000 >= before/1000 );
+            ASSERT( e.date()/1000 <= after/1000 );
+        }
+    };
+
     class MinMaxElementTest {
     public:
 
@@ -1095,6 +1113,7 @@ namespace JsobjTests {
             add< ValueStreamTests::ElementAppend >();
             add< SubObjectBuilder >();
             add< DateNowBuilder >();
+            add< TimeTBuilder >();
             add< MinMaxElementTest >();
             add< ComparatorTest >();
             add< ExtractFieldsTest >();