go integration and wikipedia

frontend/node_modules/date-fns/parse/_lib/parsers/FractionOfSecondParser.mjs

@@ -0,0 +1,19 @@
+import { Parser } from "../Parser.mjs";
+import { mapValue, parseNDigits } from "../utils.mjs";
+
+export class FractionOfSecondParser extends Parser {
+  priority = 30;
+
+  parse(dateString, token) {
+    const valueCallback = (value) =>
+      Math.trunc(value * Math.pow(10, -token.length + 3));
+    return mapValue(parseNDigits(token.length, dateString), valueCallback);
+  }
+
+  set(date, _flags, value) {
+    date.setMilliseconds(value);
+    return date;
+  }
+
+  incompatibleTokens = ["t", "T"];
+}