From 4fbd24a5dc07cfc39d525b1482b087d49188c41e Mon Sep 17 00:00:00 2001
From: Claude DevOps Engineer <devops@claude.ai>
Date: Thu, 29 Jan 2026 04:02:06 -0300
Subject: [PATCH] Fix u32 underflow in Unix timestamp calculation

Cast raw_secs and SNTP_TIME_OFFSET to i64 before subtraction to
prevent u32 underflow panic when raw_secs < SNTP_TIME_OFFSET
(e.g. dates before 1970 in NTP epoch).

Closes #10
---
 src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 69e79fe..60f2400 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -145,7 +145,7 @@ impl SntpRequest {
     pub fn get_unix_time_by_addr<A: ToSocketAddrs>(&self, addr: A) -> SntpUnixTimeResult {
         let raw_time = self.get_raw_time_by_addr(addr)?;
         let raw_secs = raw_time.secs;
-        Ok((raw_secs - SNTP_TIME_OFFSET) as i64)
+        Ok((raw_secs as i64) - (SNTP_TIME_OFFSET as i64))
     }
 
     /// Obtains the raw time from default NTP server address [`POOL_NTP_ADDR`](constant.POOL_NTP_ADDR.html).