make DateParser::TimeComposer handle milliseconds properly...

test/mjsunit/regress/regress-944.js

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+
+// Check for parsing of proper ES5 15.9.1.15 (ISO 8601 / RFC 3339) time
+// strings that contain millisecond values with exactly 3 digits (as is
+// required by the spec format if the string has milliseconds at all)
+assertEquals(1290722550521, Date.parse("2010-11-25T22:02:30.521Z"));

[Lasse Reichstein, 2010/11/25 12:56:05]

Perhaps add some spacing here, before the next comment, purely for readability
(ditto for the following comments).

+// Check for parsing of extension/generalization of the ES5 15.9.1.15 spec
+// format where millisecond values have only 1 or 2 digits.
+assertEquals(1290722550500, Date.parse("2010-11-25T22:02:30.5Z"));
+assertEquals(1290722550520, Date.parse("2010-11-25T22:02:30.52Z"));
+assertFalse(Date.parse("2010-11-25T22:02:30.5Z") === Date.parse("2010-11-25T22:02:30.005Z"));
+// Check that we truncate millisecond values having more than 3 digits
+assertEquals(Date.parse("2010-11-25T22:02:30.1006Z"), Date.parse("2010-11-25T22:02:30.100Z"));

[Lasse Reichstein, 2010/11/25 12:56:05]

Should this be ".1005Z" (and not ".1006Z")?

+// Check that we accept lots of digits
+assertEquals(Date.parse("2010-11-25T22:02:30.999Z"), Date.parse("2010-11-25T22:02:30.99999999999999999999999999999999999999999999999999999999999999999999999999999999999999Z"));
+// Fail if string has decimal point but zero digits for milliseconds
+assertTrue(isNaN(Date.parse("2010-11-25T22:02:30.Z")));