fix: use local timezone in console log timestamps

formatConsoleTimestamp previously used Date.toISOString() which always
returns UTC time (suffixed with Z). This confused users whose local
timezone differs from UTC.

Now uses local time methods (getHours, getMinutes, etc.) and appends the
local UTC offset (e.g. +08:00) instead of Z. The pretty style returns
local HH:MM:SS. The hasTimestampPrefix regex is updated to accept both
Z and +/-HH:MM offset suffixes.

Closes #14699

src/logging/console.ts

@@ -135,16 +135,32 @@ function isEpipeError(err: unknown): boolean {
   return code === "EPIPE" || code === "EIO";
 }
 
-function formatConsoleTimestamp(style: ConsoleStyle): string {
-  const now = new Date().toISOString();
+export function formatConsoleTimestamp(style: ConsoleStyle): string {
+  const now = new Date();
   if (style === "pretty") {
-    return now.slice(11, 19);
+    const h = String(now.getHours()).padStart(2, "0");
+    const m = String(now.getMinutes()).padStart(2, "0");
+    const s = String(now.getSeconds()).padStart(2, "0");
+    return `${h}:${m}:${s}`;
   }
-  return now;
+  const year = now.getFullYear();
+  const month = String(now.getMonth() + 1).padStart(2, "0");
+  const day = String(now.getDate()).padStart(2, "0");
+  const h = String(now.getHours()).padStart(2, "0");
+  const m = String(now.getMinutes()).padStart(2, "0");
+  const s = String(now.getSeconds()).padStart(2, "0");
+  const ms = String(now.getMilliseconds()).padStart(3, "0");
+  const tzOffset = now.getTimezoneOffset();
+  const tzSign = tzOffset <= 0 ? "+" : "-";
+  const tzHours = String(Math.floor(Math.abs(tzOffset) / 60)).padStart(2, "0");
+  const tzMinutes = String(Math.abs(tzOffset) % 60).padStart(2, "0");
+  return `${year}-${month}-${day}T${h}:${m}:${s}.${ms}${tzSign}${tzHours}:${tzMinutes}`;
 }
 
 function hasTimestampPrefix(value: string): boolean {
-  return /^(?:\d{2}:\d{2}:\d{2}|\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?Z?)/.test(value);
+  return /^(?:\d{2}:\d{2}:\d{2}|\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})?)/.test(
+    value,
+  );
 }
 
 function isJsonPayload(value: string): boolean {