Make Date.parse accept extended years format too (#3177)

ES5.1 15.9.4.2 specifies that Date.parse (string) has to accept
at least Date Time String Format: YYYY-MM-DDTHH:mm:ss.sssZ. But
the spec allows implementation-specific fallbacks. Additionally
ES5.1 15.9.1.15.1 specifies Extended years format, but isn't
explicitly required to be accepted by Date.parse. But ES6 already
clarified that Date.parse has to accept extended years format too.

JerryScript-DCO-1.0-Signed-off-by: Csaba Osztrogonác oszi@inf.u-szeged.hu

tests/jerry/date-parse.js

@@ -49,7 +49,14 @@ var wrongFormats = ["",
                     "2015-01-01T00:60",
                     "2015-01-01T-1:00",
                     "2015-01-01T00:-1",
-                    "2e+3"];
+                    "2e+3",
+                    "+2015-01-01",
+                    "-2015-01-01",
+                    "+02015-01-01",
+                    "-02015-01-01",
+                    "002015-01-01",
+                    "+0002015-01-01",
+                    "-0002015-01-01"];
 
 for (i in wrongFormats) {
   var d = Date.parse(wrongFormats[i]);
@@ -96,3 +103,20 @@ assert (d == 1420081200000);
 
 d = Date.parse("2015-07-03T14:35:43.123+01:30");
 assert (d == 1435928743123);
+
+assert (Date.parse("-271821-04-20T00:00:00.000Z") == -8640000000000000)
+assert (Date.parse("-000001-12-31T23:59:59.999Z") == -62167219200001)
+assert (Date.parse("0000-01-01T00:00:00.000Z") == -62167219200000)
+assert (Date.parse("0009-12-31T23:59:59.999Z") == -61851600000001)
+assert (Date.parse("0010-01-01T00:00:00.000Z") == -61851600000000)
+assert (Date.parse("0099-12-31T23:59:59.999Z") == -59011459200001)
+assert (Date.parse("0100-01-01T00:00:00.000Z") == -59011459200000)
+assert (Date.parse("0999-12-31T23:59:59.999Z") == -30610224000001)
+assert (Date.parse("1000-01-01T00:00:00.000Z") == -30610224000000)
+assert (Date.parse("1969-12-31T23:59:59.999Z") == -1)
+assert (Date.parse("1970-01-01T00:00:00.000Z") == 0)
+assert (Date.parse("1970-01-01T00:00:00.001Z") == 1)
+assert (Date.parse("9999-12-31T23:59:59.999Z") == 253402300799999)
+assert (Date.parse("+010000-01-01T00:00:00.000Z") == 253402300800000)
+assert (Date.parse("+275760-09-13T00:00:00.000Z") == 8640000000000000)
+assert (Date.parse("+275760-09-13T00:00:00.001Z") == 8640000000000001)