From c2c06694daa69e4638af82b17f40b7d20989638a Mon Sep 17 00:00:00 2001
From: Satsuki Yanagi <17376330+u1-liquid@users.noreply.github.com>
Date: Mon, 8 Jul 2019 13:55:22 +0900
Subject: [PATCH] Allow only one kind of date identifier at once (#5120)

---
 src/misc/format-time-string.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/misc/format-time-string.ts b/src/misc/format-time-string.ts
index 4729036e5..caa31780b 100644
--- a/src/misc/format-time-string.ts
+++ b/src/misc/format-time-string.ts
@@ -42,7 +42,7 @@ function formatDateTimeString(date: Date, format: string): string {
 }
 
 export function formatTimeString(date: Date, format: string): string {
-	return format.replace(/\[(([^\[]|\[\])*)\]|([yMdHhmst]{1,4})/g, (match: string, localeformat?: string, unused?, datetimeformat?: string) => {
+	return format.replace(/\[(([^\[]|\[\])*)\]|(([yMdHhmst])\4{0,3})/g, (match: string, localeformat?: string, unused?, datetimeformat?: string) => {
 		if (localeformat) return formatLocaleString(date, localeformat);
 		if (datetimeformat) return formatDateTimeString(date, datetimeformat);
 		return match;