1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/non262/Date/parse-from-tostring-methods.js b/js/src/tests/non262/Date/parse-from-tostring-methods.js
new file mode 100644
index 0000000000..b6bf577bb0
--- /dev/null
+++ b/js/src/tests/non262/Date/parse-from-tostring-methods.js
@@ -0,0 +1,31 @@
+let dates = [
+    "0041-09-23", "+000041-09-23", "-000041-09-23",
+    "0091-09-23", "+000091-09-23", "-000091-09-23",
+    "0217-09-23", "+000217-09-23", "-000217-09-23",
+    "2017-09-23", "+002017-09-23", "-002017-09-23",
+                  "+022017-09-23", "-022017-09-23",
+                  "+202017-09-23", "-202017-09-23",
+];
+
+for (let date of dates) {
+    let d = new Date(date);
+    let timeValue = d.valueOf();
+
+    assertEq(Number.isNaN(timeValue), false, `Cannot parse "${date}" as ISO date-only form`);
+
+    // Ensure parsing the results of toString(), toUTCString(), and toISOString()
+    // gives the same time value as required by 20.3.3.2 Date.parse.
+    //
+    // Additional requirement not present in ES2019 draft rev 7acacc524213058a2368b5fa751fac7ea08ba230:
+    // The time zone offset must not contain seconds (or milliseconds) for |Date.parse(x.toString())|
+    // to be equal to |x.valueOf()|.
+    let tz = d.getTimezoneOffset();
+    if (Math.trunc(tz) === tz) {
+        assertEq(Date.parse(d.toString()), timeValue, `Cannot parse from toString() of "${date}"`);
+    }
+    assertEq(Date.parse(d.toUTCString()), timeValue, `Cannot parse from toUTCString() of "${date}"`);
+    assertEq(Date.parse(d.toISOString()), timeValue, `Cannot parse from toISOString() of "${date}"`);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);