From d35a5c67080f8f07bed88b68bd7763e41a61f565 Mon Sep 17 00:00:00 2001
From: cyberman54 <cyberman@obh.snafu.de>
Date: Sat, 26 Feb 2022 20:04:09 +0100
Subject: [PATCH] fix timestamp in SD logging

---
 src/sdcard.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/sdcard.cpp b/src/sdcard.cpp
index 51b4d9a0..a6d66a7d 100644
--- a/src/sdcard.cpp
+++ b/src/sdcard.cpp
@@ -244,17 +244,19 @@ void sdcardWriteData(uint16_t noWifi, uint16_t noBle,
   if (!useSDCard)
     return;
 
-  char tempBuffer[20 + 1];
+  char timeBuffer[20 + 1];
   time_t t = time(NULL);
   struct tm tt;
   gmtime_r(&t, &tt); // make UTC timestamp
+  strftime(timeBuffer, sizeof(timeBuffer), "%FT%TZ", &tt);
 
 #if (HAS_SDS011)
   sdsStatus_t sds;
 #endif
 
   ESP_LOGI(TAG, "writing data to SD-card");
-  fprintf(data_file, "%FT%TZ", &tt);
+
+  fprintf(data_file, "%s", timeBuffer);
   fprintf(data_file, ",%d,%d", noWifi, noBle);
 #if (defined BAT_MEASURE_ADC || defined HAS_PMU)
   fprintf(data_file, ",%d", voltage);