Updated VM and JS versions of Date to allow underflow and overflow.

tests/corelib/date_time_test.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Dart test program for Date.
 
 class DateTest {
   // Tests if the time moves eventually forward.
   static void testNow() {
     var t1 = new Date.now();
     bool timeMovedForward = false;
@@ skipping 246 matching lines @@
                                                             isUtc: true));
     Expect.throws(() => new Date.fromMillisecondsSinceEpoch(-8640000000000001,
                                                             isUtc: true));
     Expect.throws(() => new Date.fromMillisecondsSinceEpoch(8640000000000001));
     Expect.throws(
         () => new Date.fromMillisecondsSinceEpoch(-8640000000000001));
     dt = new Date.fromMillisecondsSinceEpoch(8640000000000000);
     Expect.throws(() => new Date(dt.year, dt.month, dt.day,
                                  dt.hour, dt.minute, 0, 1));
     dt = new Date.fromMillisecondsSinceEpoch(-8640000000000000);
-    // TODO(floitsch): Update comment after refactoring.
-    // This test currently fails because the arguments must not be negative.
-    // However we are going to allow negative (and overflowing) arguments and
-    // this line will then throw for the correct reason.
     Expect.throws(() => new Date(dt.year, dt.month, dt.day,
-                                 dt.hour, dt.minute, 0, -1));
+                                 dt.hour, dt.minute, 0, -1, isUtc: true));
   }
 
   static void testUTCGetters() {
     var dt = new Date.fromMillisecondsSinceEpoch(1305140315000, isUtc: true);
     Expect.equals(2011, dt.year);
     Expect.equals(5, dt.month);
     Expect.equals(11, dt.day);
     Expect.equals(18, dt.hour);
     Expect.equals(58, dt.minute);
     Expect.equals(35, dt.second);
@@ skipping 136 matching lines @@
     Expect.equals(dt1.hour, dt2.hour);
     Expect.equals(dt1.minute, dt2.minute);
     Expect.equals(dt1.second + 3, dt2.second);
     Expect.equals(dt1.millisecond + 5, dt2.millisecond);
     var dt3 = dt2.subtract(new Duration(milliseconds:
         3 * Duration.MILLISECONDS_PER_SECOND + 5));
     Expect.equals(true, dt1 == dt3);
     Expect.equals(false, dt1 == dt2);
   }
 
+  static void testUnderflowAndOverflow() {
+    final dtBase = new Date(2012, 6, 20, 12, 30, 30, 500);
+
+    // Millisecond
+    print("  >>> Millisecond+");
+    var dt = new Date(dtBase.year, dtBase.month, dtBase.day, dtBase.hour,
+                      dtBase.minute, dtBase.second, 1000);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second + 1, dt.second);
+    Expect.equals(0, dt.millisecond);
+
+    print("  >>> Millisecond-");
+    dt = new Date(dtBase.year, dtBase.month, dtBase.day, dtBase.hour,
+                  dtBase.minute, dtBase.second, -1000);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second - 1, dt.second);
+    Expect.equals(0, dt.millisecond);
+
+    // Second
+    print("  >>> Second+");
+    dt = new Date(dtBase.year, dtBase.month, dtBase.day, dtBase.hour,
+                  dtBase.minute, 60, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute + 1, dt.minute);
+    Expect.equals(0, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    print("  >>> Second-");
+    dt = new Date(dtBase.year, dtBase.month, dtBase.day, dtBase.hour,
+                  dtBase.minute, -60, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute - 1, dt.minute);
+    Expect.equals(0, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    // Minute
+    print("  >>> Minute+");
+    dt = new Date(dtBase.year, dtBase.month, dtBase.day, dtBase.hour, 60,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour + 1, dt.hour);
+    Expect.equals(0, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    print("  >>> Minute-");
+    dt = new Date(dtBase.year, dtBase.month, dtBase.day, dtBase.hour, -60,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour - 1, dt.hour);
+    Expect.equals(0, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    // Hour
+    print("  >>> Hour+");
+    dt = new Date(dtBase.year, dtBase.month, dtBase.day, 24, dtBase.minute,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day + 1, dt.day);
+    Expect.equals(0, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    print("  >>> Hour-");
+    dt = new Date(dtBase.year, dtBase.month, dtBase.day, -24, dtBase.minute,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month, dt.month);
+    Expect.equals(dtBase.day - 1, dt.day);
+    Expect.equals(0, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    // Day
+    print("  >>> Day+");
+    dt = new Date(dtBase.year, dtBase.month, 31, dtBase.hour, dtBase.minute,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month + 1, dt.month);
+    Expect.equals(1, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    print("  >>> Day-");
+    dt = new Date(dtBase.year, dtBase.month, -30, dtBase.hour, dtBase.minute,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year, dt.year);
+    Expect.equals(dtBase.month - 1, dt.month);
+    Expect.equals(1, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    // Month
+    print("  >>> Month+");
+    dt = new Date(dtBase.year, 13, dtBase.day, dtBase.hour, dtBase.minute,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year + 1, dt.year);
+    Expect.equals(1, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    print("  >>> Month-");
+    dt = new Date(dtBase.year, -11, dtBase.day, dtBase.hour, dtBase.minute,
+                  dtBase.second, dtBase.millisecond);
+    Expect.equals(dtBase.year - 1, dt.year);
+    Expect.equals(1, dt.month);
+    Expect.equals(dtBase.day, dt.day);
+    Expect.equals(dtBase.hour, dt.hour);
+    Expect.equals(dtBase.minute, dt.minute);
+    Expect.equals(dtBase.second, dt.second);
+    Expect.equals(dtBase.millisecond, dt.millisecond);
+
+    // Flowing all the way up the chain.
+    print("  >>> Flow+");
+    var dtBase1 = new Date(2012, 12, 31, 23, 59, 59, 999);
+    var dtTick = new Date(dtBase1.year, dtBase1.month, dtBase1.day,
+                          dtBase1.hour, dtBase1.minute, dtBase1.second,
+                          dtBase1.millisecond + 1);
+    Expect.equals(dtBase1.year + 1, dtTick.year);
+    Expect.equals(1, dtTick.month);
+    Expect.equals(1, dtTick.day);
+    Expect.equals(0, dtTick.hour);
+    Expect.equals(0, dtTick.minute);
+    Expect.equals(0, dtTick.second);
+    Expect.equals(0, dtTick.millisecond);
+
+    print("  >>> Flow-");
+    dtBase1 = new Date(2012, 1, 1, 0, 0, 0, 0);
+    dtTick = new Date(dtBase1.year, dtBase1.month, dtBase1.day, dtBase1.hour,
+                      dtBase1.minute, dtBase1.second, dtBase1.millisecond - 1);
+    Expect.equals(dtBase1.year - 1, dtTick.year);
+    Expect.equals(12, dtTick.month);
+    Expect.equals(31, dtTick.day);
+    Expect.equals(23, dtTick.hour);
+    Expect.equals(59, dtTick.minute);
+    Expect.equals(59, dtTick.second);
+    Expect.equals(999, dtTick.millisecond);
+
+    print("  >>> extra underflow");
+    dtTick = new Date(dtBase1.year, dtBase1.month, dtBase1.day, -17520,
+                      dtBase1.minute, dtBase1.second, dtBase1.millisecond);
+    Expect.equals(dtBase1.year - 2, dtTick.year);
+    Expect.equals(dtBase1.month, dtTick.month);
+    Expect.equals(dtBase1.day, dtTick.day);
+    Expect.equals(dtBase1.hour, dtTick.hour);
+    Expect.equals(dtBase1.minute, dtTick.minute);
+    Expect.equals(dtBase1.second, dtTick.second);
+    Expect.equals(dtBase1.millisecond, dtTick.millisecond);
+  }
+
   static void testDateStrings() {
     // TODO(floitsch): Clean up the Date API that deals with strings.
     var dt1 = new Date.fromString("2011-05-11 18:58:35Z");
     Expect.equals(1305140315000, dt1.millisecondsSinceEpoch);
     Expect.isTrue(dt1.isUtc);
     dt1 = new Date.fromString("20110511 18:58:35z");
     Expect.equals(1305140315000, dt1.millisecondsSinceEpoch);
     Expect.isTrue(dt1.isUtc);
     dt1 = new Date.fromString("+20110511 18:58:35z");
     Expect.equals(1305140315000, dt1.millisecondsSinceEpoch);
@@ skipping 180 matching lines @@
     Expect.equals(Date.TUE, d.weekday);
     d = new Date(2011, 10, 3, 23, 45, 37, 0);
     Expect.equals(Date.MON, d.weekday);
     d = new Date(2011, 10, 2, 23, 45, 37, 0);
     Expect.equals(Date.SUN, d.weekday);
     d = new Date(2011, 10, 1, 23, 45, 37, 0);
     Expect.equals(Date.SAT, d.weekday);
     d = new Date(2011, 9, 30, 23, 45, 37, 0);
     Expect.equals(Date.FRI, d.weekday);
   }
 

[Lasse Reichstein Nielsen, 2012/08/24 08:39:02]

Please add test that leap-days are correct for any normal (non 0..99) period of
400 years plus the years 0..99.
Check at least:
  new Date(year, 2, 29) is in February in leap years and March in non-leap
years, and
  new Date(year, 3, 0)  is always in February and is the 29th in leap years and
28th in non-leap years.

   static void testMain() {
     testNow();
     testValue();
     testConstructors();
     testUTCGetters();
     testLocalGetters();
     testChangeTimeZone();
     testSubAdd();
+    testUnderflowAndOverflow();
     testDateStrings();
     testEquivalentYears();
     testExtremes();
     testFarAwayDates();
     testWeekday();
   }
 }
 
 main() {
   DateTest.testMain();
 }