From 2f63895599ee28283cb0a7bd397165c4f6f2ac7b Mon Sep 17 00:00:00 2001
From: Theo Arends <11044339+arendst@users.noreply.github.com>
Date: Tue, 5 Jan 2021 10:37:05 +0100
Subject: [PATCH] Fix RTOS time update (#10334)

---
 tasmota/support_rtc.ino | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/tasmota/support_rtc.ino b/tasmota/support_rtc.ino
index 9884b337f..e9afa4597 100644
--- a/tasmota/support_rtc.ino
+++ b/tasmota/support_rtc.ino
@@ -400,15 +400,6 @@ void RtcSecond(void)
     } else {
       TasmotaGlobal.rules_flag.time_set = 1;
     }
-
-#ifdef ESP32
-    // Sync RTOS time to be used by SD Card time stamps
-    struct timeval tv;
-    tv.tv_sec = Rtc.local_time;
-    tv.tv_usec = 0;
-    settimeofday(&tv, nullptr);
-#endif  // ESP32
-
   } else {
     Rtc.utc_time++;  // Increment every second
   }
@@ -463,6 +454,17 @@ void RtcSecond(void)
       Rtc.midnight = Rtc.local_time;
       Rtc.midnight_now = true;
     }
+
+#ifdef ESP32
+    if (mutex) {  // Time is just synced and is valid
+      // Sync RTOS time to be used by SD Card time stamps
+      struct timeval tv;
+      tv.tv_sec = Rtc.local_time;
+      tv.tv_usec = 0;
+      settimeofday(&tv, nullptr);
+    }
+#endif  // ESP32
+
   }
 
   RtcTime.year += 1970;