Use local hh:mm:ss in SD CSV human-readable column

src/sd_logger.cpp

@@ -39,18 +39,18 @@ static String format_date_utc(uint32_t ts_utc) {
   return String(buf);
 }
 
-static String format_hms_utc(uint32_t ts_utc) {
+static String format_hms_local(uint32_t ts_utc) {
   if (ts_utc == 0) {
     return "";
   }
   time_t t = static_cast<time_t>(ts_utc);
-  struct tm tm_utc;
-  gmtime_r(&t, &tm_utc);
+  struct tm tm_local;
+  localtime_r(&t, &tm_local);
   char buf[16];
   snprintf(buf, sizeof(buf), "%02d:%02d:%02d",
-           tm_utc.tm_hour,
-           tm_utc.tm_min,
-           tm_utc.tm_sec);
+           tm_local.tm_hour,
+           tm_local.tm_min,
+           tm_local.tm_sec);
   return String(buf);
 }
 
@@ -102,13 +102,13 @@ void sd_logger_log_sample(const MeterData &data, bool include_error_text) {
   }
 
   if (new_file) {
-    f.println("ts_utc,ts_hms_utc,p_w,p1_w,p2_w,p3_w,e_kwh,bat_v,bat_pct,rssi,snr,err_m,err_d,err_tx,err_last");
+    f.println("ts_utc,ts_hms_local,p_w,p1_w,p2_w,p3_w,e_kwh,bat_v,bat_pct,rssi,snr,err_m,err_d,err_tx,err_last");
   }
 
-  String ts_hms_utc = format_hms_utc(data.ts_utc);
+  String ts_hms_local = format_hms_local(data.ts_utc);
   f.print(data.ts_utc);
   f.print(',');
-  f.print(ts_hms_utc);
+  f.print(ts_hms_local);
   f.print(',');
   f.print(data.total_power_w, 1);
   f.print(',');