make DateParser::TimeComposer handle milliseconds properly...

test/mjsunit/regress/regress-944.js

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+// Checke for proper parsing of ES5 15.9.1.15 (ISO 8601 / RFC 3339) times

[Lasse Reichstein, 2010/11/25 10:17:19]

"Checke"->"Check".
Technically this is not ES5 15.9.1.15 parsing, since that only specifies
three-digit milliseconds. Say that it's testing an extension, or generalization,
of the spec format.

+// with millisecond values that have only 1 or 2 digits.
+assertEquals(1290690150500, Date.parse("2010-11-25T22:02:30.5"));

[Lasse Reichstein, 2010/11/25 10:17:19]

Also check that we fail with zero digits (i.e. "2010-11-25T22:02:30." gives
NaN).

Also check with more than three digits (since the parser allows it). In
particular, check that
- we truncate values instead of rounding (.1005 gives .100, not .101).
- we accept any number of digits (no reason to be stingy), e.g.
"2010-11-25T22:02:30.99999999999999999999999999999999999999999999999999999999999999999999999999999999999999"
(or more :)

+assertEquals(1290690150520, Date.parse("2010-11-25T22:02:30.52"));
+assertEquals(1290690150521, Date.parse("2010-11-25T22:02:30.521"));
+assertEquals(false, Date.parse("2010-11-25T22:02:30.5") === Date.parse("2010-11-25T22:02:30.005"));

[Lasse Reichstein, 2010/11/25 10:17:19]

Use assertFalse(...) instead of assertEquals(false, ...) (or feel free to add
assertNotEquals to mjsunit.js).