From 6ea8d9d5fc8e9e5d58914c33824a6224bc40f43e Mon Sep 17 00:00:00 2001
From: acidburns <neon22@web.de>
Date: Mon, 16 Feb 2026 11:14:30 +0100
Subject: [PATCH] Use configured local timezone in web UI and drop legacy
 history CSV parsing

---
 src/web_server.cpp | 71 +++++++++++++++++++---------------------------
 1 file changed, 29 insertions(+), 42 deletions(-)

diff --git a/src/web_server.cpp b/src/web_server.cpp
index 920fb52..c68dbb3 100644
--- a/src/web_server.cpp
+++ b/src/web_server.cpp
@@ -57,26 +57,23 @@ static HistoryJob g_history = {};
 static constexpr size_t SD_LIST_MAX_FILES = 200;
 static constexpr size_t SD_DOWNLOAD_MAX_PATH = 160;
 
-static String format_utc_hms(uint32_t ts_utc) {
+static String format_local_hms(uint32_t ts_utc) {
   if (ts_utc == 0) {
     return "n/a";
   }
   time_t t = static_cast<time_t>(ts_utc);
-  struct tm tm_utc;
-  gmtime_r(&t, &tm_utc);
-  char buf[16];
-  snprintf(buf, sizeof(buf), "%02d:%02d:%02d UTC",
-           tm_utc.tm_hour,
-           tm_utc.tm_min,
-           tm_utc.tm_sec);
+  struct tm tm_local;
+  localtime_r(&t, &tm_local);
+  char buf[24];
+  strftime(buf, sizeof(buf), "%H:%M:%S %Z", &tm_local);
   return String(buf);
 }
 
-static String format_epoch_hms(uint32_t ts_utc) {
+static String format_epoch_local_hms(uint32_t ts_utc) {
   if (ts_utc == 0) {
     return "n/a";
   }
-  return String(ts_utc) + " (" + format_utc_hms(ts_utc) + ")";
+  return String(ts_utc) + " (" + format_local_hms(ts_utc) + ")";
 }
 
 static uint32_t timestamp_age_seconds(uint32_t ts_utc) {
@@ -277,12 +274,12 @@ static bool history_parse_line(const char *line, uint32_t &ts_out, float &p_out)
   if (!line || line[0] < '0' || line[0] > '9') {
     return false;
   }
-  const char *comma = strchr(line, ',');
-  if (!comma) {
+  const char *comma1 = strchr(line, ',');
+  if (!comma1) {
     return false;
   }
   char ts_buf[16];
-  size_t ts_len = static_cast<size_t>(comma - line);
+  size_t ts_len = static_cast<size_t>(comma1 - line);
   if (ts_len >= sizeof(ts_buf)) {
     return false;
   }
@@ -293,32 +290,22 @@ static bool history_parse_line(const char *line, uint32_t &ts_out, float &p_out)
   if (end == ts_buf) {
     return false;
   }
-  auto parse_float_field = [](const char *start, const char *end, float &out) -> bool {
-    if (!start) {
-      return false;
-    }
-    char p_buf[16];
-    size_t p_len = end ? static_cast<size_t>(end - start) : strlen(start);
-    if (p_len == 0 || p_len >= sizeof(p_buf)) {
-      return false;
-    }
-    memcpy(p_buf, start, p_len);
-    p_buf[p_len] = '\0';
-    char *endp = nullptr;
-    out = strtof(p_buf, &endp);
-    return endp != p_buf;
-  };
-
-  const char *field2_start = comma + 1;
-  const char *field2_end = strchr(field2_start, ',');
-  float p = 0.0f;
-  bool parsed_power = parse_float_field(field2_start, field2_end, p);
-  if (!parsed_power && field2_end) {
-    const char *field3_start = field2_end + 1;
-    const char *field3_end = strchr(field3_start, ',');
-    parsed_power = parse_float_field(field3_start, field3_end, p);
+  const char *comma2 = strchr(comma1 + 1, ',');
+  if (!comma2) {
+    return false;
   }
-  if (!parsed_power) {
+  const char *p_start = comma2 + 1;
+  const char *p_end = strchr(p_start, ',');
+  char p_buf[16];
+  size_t p_len = p_end ? static_cast<size_t>(p_end - p_start) : strlen(p_start);
+  if (p_len == 0 || p_len >= sizeof(p_buf)) {
+    return false;
+  }
+  memcpy(p_buf, p_start, p_len);
+  p_buf[p_len] = '\0';
+  char *endp = nullptr;
+  float p = strtof(p_buf, &endp);
+  if (endp == p_buf) {
     return false;
   }
   ts_out = ts;
@@ -418,7 +405,7 @@ static String render_sender_block(const SenderStatus &status) {
   if (!status.has_data) {
     s += "No data";
   } else {
-    s += "Last update: " + format_epoch_hms(status.last_update_ts_utc);
+    s += "Last update: " + format_epoch_local_hms(status.last_update_ts_utc);
     if (time_is_synced()) {
       s += " (" + String(timestamp_age_seconds(status.last_update_ts_utc)) + "s ago)";
     }
@@ -437,7 +424,7 @@ static String render_sender_block(const SenderStatus &status) {
     duplicate_pct = (static_cast<float>(duplicate_batches) * 100.0f) / static_cast<float>(total_batches);
   }
   s += "<br>Dup batches: " + String(duplicate_batches) + "/" + String(total_batches) + " (" + String(duplicate_pct, 1) + "%)";
-  s += " last: " + format_epoch_hms(status.rx_last_duplicate_ts_utc);
+  s += " last: " + format_epoch_local_hms(status.rx_last_duplicate_ts_utc);
   if (time_is_synced() && status.rx_last_duplicate_ts_utc > 0) {
     s += " (" + String(timestamp_age_seconds(status.rx_last_duplicate_ts_utc)) + "s ago)";
   }
@@ -665,14 +652,14 @@ static void handle_sender() {
       if (g_last_batch_count[i] > 0) {
         html += "<h3>Last batch (" + String(g_last_batch_count[i]) + " samples)</h3>";
         html += "<table border='1' cellspacing='0' cellpadding='3'>";
-        html += "<tr><th>#</th><th>ts_utc</th><th>ts_hms_utc</th><th>e_kwh</th><th>p_w</th><th>p1_w</th><th>p2_w</th><th>p3_w</th>";
+        html += "<tr><th>#</th><th>ts_utc</th><th>ts_hms_local</th><th>e_kwh</th><th>p_w</th><th>p1_w</th><th>p2_w</th><th>p3_w</th>";
         html += "<th>bat_v</th><th>bat_pct</th><th>rssi</th><th>snr</th><th>err_tx</th><th>err_last</th><th>rx_reject</th></tr>";
         for (uint8_t r = 0; r < g_last_batch_count[i]; ++r) {
           const MeterData &d = g_last_batch[i][r];
           html += "<tr>";
           html += "<td>" + String(r) + "</td>";
           html += "<td>" + String(d.ts_utc) + "</td>";
-          html += "<td>" + format_utc_hms(d.ts_utc) + "</td>";
+          html += "<td>" + format_local_hms(d.ts_utc) + "</td>";
           html += "<td>" + String(d.energy_total_kwh, 2) + "</td>";
           html += "<td>" + String(round_power_w(d.total_power_w)) + "</td>";
           html += "<td>" + String(round_power_w(d.phase_power_w[0])) + "</td>";