From 88715d29e9785e60939a1635c5ff3e6f677e3403 Mon Sep 17 00:00:00 2001
From: gabime <gmelman1@gmail.com>
Date: Mon, 17 Mar 2025 16:07:31 +0200
Subject: [PATCH] cherrypick pr #3661

---
 src/pattern_formatter.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/pattern_formatter.cpp b/src/pattern_formatter.cpp
index 0456121e..79c8c62b 100644
--- a/src/pattern_formatter.cpp
+++ b/src/pattern_formatter.cpp
@@ -60,6 +60,9 @@ public:
             pad_it(remaining_pad_);
         } else if (padinfo_.truncate_) {
             long new_size = static_cast<long>(dest_.size()) + remaining_pad_;
+            if (new_size < 0) {
+                new_size = 0;
+            }
             dest_.resize(static_cast<size_t>(new_size));
         }
     }
@@ -247,7 +250,7 @@ public:
         : flag_formatter(padinfo) {}
 
     void format(const details::log_msg &, const std::tm &tm_time, memory_buf_t &dest) override {
-        constexpr size_t field_size = 10;
+        constexpr size_t field_size = 8;
         ScopedPadder p(field_size, padinfo_, dest);
 
         fmt_helper::pad2(tm_time.tm_mon + 1, dest);