refactor(timezone): checkTime in dnode and mnode implementations and timetruncate logic for interval (3.3.6 branch)

include/common/tmsg.h

@@ -1973,7 +1973,14 @@ void    tFreeSRetrieveFuncRsp(SRetrieveFuncRsp* pRsp);
 
 typedef struct {
   int32_t       statusInterval;
-  int64_t       checkTime;                  // 1970-01-01 00:00:00.000
+  /*
+    Local timezone UTC offset in seconds (east-positive, e.g. +28800 for
+    Asia/Shanghai).  Derived from taosGetLocalTimezoneOffset() on each
+    status report.  Paired with the timezone string in
+    mndCheckClusterCfgPara: a mismatch is reported only when both the
+    timezone string AND this offset differ.
+  */
+  int64_t       checkTime;
   char          timezone[TD_TIMEZONE_LEN];  // tsTimezone
   char          locale[TD_LOCALE_LEN];      // tsLocale
   char          charset[TD_LOCALE_LEN];     // tsCharset

source/common/src/ttime.c

@@ -876,6 +876,33 @@ int64_t taosTimeGetIntervalEnd(int64_t intervalStart, const SInterval* pInterval
          1;
 }
 
+/*
+  getTZOffsetAtTicks - return the east-positive UTC offset (in ticks) that is
+  in effect at the given timestamp.
+
+  Unlike taosGetTZOffsetSeconds() which queries the offset for "now", this
+  function converts `ticks` to local time via taosLocalTime() and then
+  derives the offset as (taosTimeGm(local) - t_sec), so it correctly
+  resolves DST for the *target* instant.
+
+  On conversion failure 0 is returned (UTC fallback).
+ */
+static int64_t getTZOffsetAtTicks(int64_t ticks, int32_t precision, timezone_t tz) {
+  int64_t   factor = TSDB_TICK_PER_SECOND(precision);
+  int64_t   t_sec_ticks = ticks / factor;
+  if (ticks < 0 && ticks % factor != 0) {
+    t_sec_ticks -= 1;
+  }
+  time_t    t_sec = (time_t)t_sec_ticks;
+  struct tm tm_local;
+  if (taosLocalTime(&t_sec, &tm_local, NULL, 0, tz) == NULL) {
+    uWarn("%s failed to convert ticks:%" PRId64 " to local time, code:%d",
+          __FUNCTION__, ticks, ERRNO);
+    return 0;
+  }
+  return (int64_t)(taosTimeGm(&tm_local) - t_sec) * factor;
+}
+
 int64_t taosTimeTruncate(int64_t ts, const SInterval* pInterval) {
   if (pInterval->sliding == 0) {
     return ts;
@@ -917,10 +944,7 @@ int64_t taosTimeTruncate(int64_t ts, const SInterval* pInterval) {
     if (IS_CALENDAR_TIME_DURATION(pInterval->intervalUnit)) {
       int64_t news = (ts / pInterval->sliding) * pInterval->sliding;
       if (pInterval->slidingUnit == 'd' || pInterval->slidingUnit == 'w') {
-#if defined(WINDOWS) && _MSC_VER >= 1900
-        int64_t timezone = _timezone;
-#endif
-        news += (int64_t)(timezone * TSDB_TICK_PER_SECOND(precision));
+        news -= getTZOffsetAtTicks(news, precision, pInterval->timezone);
       }
 
       start = news;
@@ -952,18 +976,7 @@ int64_t taosTimeTruncate(int64_t ts, const SInterval* pInterval) {
       start = (delta / pInterval->sliding + factor) * pInterval->sliding;
 
       if (pInterval->intervalUnit == 'd' || pInterval->intervalUnit == 'w') {
-        /*
-         * here we revised the start time of day according to the local time zone,
-         * but in case of DST, the start time of one day need to be dynamically decided.
-         */
-        // todo refactor to extract function that is available for Linux/Windows/Mac platform
-#if defined(WINDOWS) && _MSC_VER >= 1900
-        // see
-        // https://docs.microsoft.com/en-us/cpp/c-runtime-library/daylight-dstbias-timezone-and-tzname?view=vs-2019
-        int64_t timezone = _timezone;
-#endif
-
-        start += (int64_t)(timezone * TSDB_TICK_PER_SECOND(precision));
+        start -= getTZOffsetAtTicks(start, precision, pInterval->timezone);
       }
 
       int64_t end = 0;

source/common/test/commonTests.cpp

@@ -1106,4 +1106,147 @@ TEST(testCase, function_taosTimeTruncate) {
   ASSERT_LE(res, 1633450000000);
 }
 
+/*
+ * Test: day-interval alignment under DST timezone (America/New_York).
+ *
+ * America/New_York has two UTC offsets:
+ *   Winter (EST): UTC-5  (-18000s)
+ *   Summer (EDT): UTC-4  (-14400s)
+ *
+ * For INTERVAL(1d) TIMEZONE('America/New_York'):
+ *   - A winter timestamp should align to midnight EST  = 05:00 UTC
+ *   - A summer timestamp should align to midnight EDT  = 04:00 UTC
+ *
+ * Historical BUG being tested: taosTimeTruncate internally calls
+ * taosGetTZOffsetSeconds() which returns the offset for "now" (the
+ * current wall-clock time), not the offset for the target timestamp.
+ * So if "now" is summer, a winter timestamp gets the EDT offset,
+ * making the day boundary 04:00 UTC instead of the correct
+ * 05:00 UTC — off by 1 hour.
+ */
+#ifndef WINDOWS
+// RAII guard to restore global timezone even if test assertions fail mid-way.
+struct TzRestoreGuard {
+  ~TzRestoreGuard() { taosSetGlobalTimezone("Asia/Shanghai"); }
+};
+
+TEST(testCase, taosTimeTruncate_DST_day_interval) {
+  TzRestoreGuard tzGuard;  // restores Asia/Shanghai on scope exit
+
+  // Setup: create a timezone object for America/New_York
+  timezone_t ny = tzalloc("America/New_York");
+  ASSERT_NE(ny, nullptr);
+
+  // Set global timezone too (for consistency)
+  ASSERT_EQ(taosSetGlobalTimezone("America/New_York"), TSDB_CODE_SUCCESS);
+
+  // -- Prepare timestamps (millisecond precision, TSDB_TIME_PRECISION_MILLI=0) --
+  //
+  // Winter:  2024-01-15 15:30:00 UTC  = 2024-01-15 10:30:00 EST
+  //          epoch_ms = 1705329000000
+  //          Correct day start = 2024-01-15 00:00:00 EST = 2024-01-15 05:00:00 UTC
+  //                            = 1705294800000 ms
+  //
+  // Summer:  2024-07-15 15:30:00 UTC  = 2024-07-15 11:30:00 EDT
+  //          epoch_ms = 1721057400000
+  //          Correct day start = 2024-07-15 00:00:00 EDT = 2024-07-15 04:00:00 UTC
+  //                            = 1721016000000 ms
+
+  const int64_t winter_ts_ms         = 1705329000000LL;  // 2024-01-15 15:30:00 UTC
+  const int64_t winter_day_start_ms  = 1705294800000LL;  // 2024-01-15 05:00:00 UTC (midnight EST)
+
+  const int64_t summer_ts_ms         = 1721057400000LL;  // 2024-07-15 15:30:00 UTC
+  const int64_t summer_day_start_ms  = 1721016000000LL;  // 2024-07-15 04:00:00 UTC (midnight EDT)
+
+  // Verify expected timestamps with taosLocalTime
+  {
+    time_t t;
+    struct tm tm_val;
+
+    // Verify winter day start is indeed midnight EST
+    t = (time_t)(winter_day_start_ms / 1000);
+    ASSERT_NE(taosLocalTime(&t, &tm_val, NULL, 0, ny), nullptr);
+    ASSERT_EQ(tm_val.tm_hour, 0) << "winter day start should be midnight local";
+    ASSERT_EQ(tm_val.tm_min, 0);
+    ASSERT_EQ(tm_val.tm_sec, 0);
+    ASSERT_EQ(tm_val.tm_mon + 1, 1);   // January
+    ASSERT_EQ(tm_val.tm_mday, 15);
+
+    // Verify summer day start is indeed midnight EDT
+    t = (time_t)(summer_day_start_ms / 1000);
+    ASSERT_NE(taosLocalTime(&t, &tm_val, NULL, 0, ny), nullptr);
+    ASSERT_EQ(tm_val.tm_hour, 0) << "summer day start should be midnight local";
+    ASSERT_EQ(tm_val.tm_min, 0);
+    ASSERT_EQ(tm_val.tm_sec, 0);
+    ASSERT_EQ(tm_val.tm_mon + 1, 7);   // July
+    ASSERT_EQ(tm_val.tm_mday, 15);
+  }
+
+  // Build SInterval for INTERVAL(1d)
+  const int64_t one_day_ms = 86400LL * 1000;
+  SInterval interval = {};
+  interval.timezone     = ny;
+  interval.intervalUnit = 'd';
+  interval.slidingUnit  = 'd';
+  interval.offsetUnit   = 0;
+  interval.precision    = TSDB_TIME_PRECISION_MILLI;
+  interval.interval     = one_day_ms;
+  interval.sliding      = one_day_ms;
+  interval.offset       = 0;
+  interval.timeRange.skey = INT64_MIN;
+  interval.timeRange.ekey = INT64_MAX;
+
+  // -- Test winter timestamp --
+  int64_t winter_result = taosTimeTruncate(winter_ts_ms, &interval);
+
+  // Convert result to local time to show what we got
+  {
+    time_t t = (time_t)(winter_result / 1000);
+    struct tm tm_val;
+    taosLocalTime(&t, &tm_val, NULL, 0, ny);
+    std::cout << "Winter ts truncated to: "
+              << (1900 + tm_val.tm_year) << "-"
+              << (tm_val.tm_mon + 1) << "-" << tm_val.tm_mday
+              << " " << tm_val.tm_hour << ":" << tm_val.tm_min << ":" << tm_val.tm_sec
+              << " (epoch_ms=" << winter_result << ")" << std::endl;
+    std::cout << "Expected:              epoch_ms=" << winter_day_start_ms << std::endl;
+  }
+
+  EXPECT_EQ(winter_result, winter_day_start_ms)
+      << "Winter day boundary should be midnight EST (05:00 UTC). "
+         "If this fails, taosTimeTruncate used the current DST offset "
+         "instead of the winter offset.";
+
+  // -- Test summer timestamp --
+  int64_t summer_result = taosTimeTruncate(summer_ts_ms, &interval);
+
+  {
+    time_t t = (time_t)(summer_result / 1000);
+    struct tm tm_val;
+    taosLocalTime(&t, &tm_val, NULL, 0, ny);
+    std::cout << "Summer ts truncated to: "
+              << (1900 + tm_val.tm_year) << "-"
+              << (tm_val.tm_mon + 1) << "-" << tm_val.tm_mday
+              << " " << tm_val.tm_hour << ":" << tm_val.tm_min << ":" << tm_val.tm_sec
+              << " (epoch_ms=" << summer_result << ")" << std::endl;
+    std::cout << "Expected:               epoch_ms=" << summer_day_start_ms << std::endl;
+  }
+
+  EXPECT_EQ(summer_result, summer_day_start_ms)
+      << "Summer day boundary should be midnight EDT (04:00 UTC). "
+         "If this fails, taosTimeTruncate used the current DST offset "
+         "instead of the summer offset.";
+
+  // After the fix, BOTH seasons should align correctly.
+  bool both_correct = (winter_result == winter_day_start_ms) &&
+                      (summer_result == summer_day_start_ms);
+  ASSERT_TRUE(both_correct)
+      << "Both winter and summer day boundaries should be correct "
+         "now that taosTimeTruncate uses per-timestamp DST resolution.";
+
+  tzfree(ny);
+  // TzRestoreGuard destructor handles taosSetGlobalTimezone("Asia/Shanghai")
+}
+#endif
+
 #pragma GCC diagnostic pop

source/dnode/mgmt/mgmt_dnode/src/dmHandle.c

@@ -196,7 +196,6 @@ void dmSendStatusReq(SDnodeMgmt *pMgmt) {
 
   req.clusterCfg.statusInterval = tsStatusInterval;
   req.clusterCfg.statusIntervalMs = tsStatusIntervalMs;
-  req.clusterCfg.checkTime = 0;
   req.clusterCfg.ttlChangeOnWrite = tsTtlChangeOnWrite;
   req.clusterCfg.enableWhiteList = tsEnableWhiteList ? 1 : 0;
   req.clusterCfg.encryptionKeyStat = tsEncryptionKeyStat;
@@ -206,12 +205,14 @@ void dmSendStatusReq(SDnodeMgmt *pMgmt) {
   req.clusterCfg.monitorParas.tsSlowLogScope = tsSlowLogScope;
   req.clusterCfg.monitorParas.tsSlowLogMaxLen = tsSlowLogMaxLen;
   req.clusterCfg.monitorParas.tsSlowLogThreshold = tsSlowLogThreshold;
-  tstrncpy(req.clusterCfg.monitorParas.tsSlowLogExceptDb, tsSlowLogExceptDb, TSDB_DB_NAME_LEN);
-  char timestr[32] = "1970-01-01 00:00:00.00";
-  if (taosParseTime(timestr, &req.clusterCfg.checkTime, (int32_t)strlen(timestr), TSDB_TIME_PRECISION_MILLI, NULL) !=
-      0) {
-    dError("failed to parse time since %s", tstrerror(code));
+  req.clusterCfg.checkTime = (int64_t)taosGetLocalTimezoneOffset();
+  if (code != 0) {
+    dError("failed to get local timezone offset, since %s", tstrerror(code));
+    (void)taosThreadMutexUnlock(&pMgmt->pData->statusInfolock);
+    return;
   }
+
+  tstrncpy(req.clusterCfg.monitorParas.tsSlowLogExceptDb, tsSlowLogExceptDb, TSDB_DB_NAME_LEN);
   memcpy(req.clusterCfg.timezone, tsTimezoneStr, TD_TIMEZONE_LEN);
   memcpy(req.clusterCfg.locale, tsLocale, TD_LOCALE_LEN);
   memcpy(req.clusterCfg.charset, tsCharset, TD_LOCALE_LEN);

source/dnode/mnode/impl/inc/mndInt.h

@@ -126,7 +126,6 @@ typedef struct SMnode {
   bool           restored;
   bool           deploy;
   char          *path;
-  int64_t        checkTime;
   SyncIndex      applied;
   SSdb          *pSdb;
   SArray        *pSteps;