diff --git a/source/common/src/ttime.c b/source/common/src/ttime.c
index 944ee6a731..9b044d6e93 100644
--- a/source/common/src/ttime.c
+++ b/source/common/src/ttime.c
@@ -844,11 +844,14 @@ int64_t taosTimeTruncate(int64_t t, const SInterval* pInterval, int32_t precisio
     } else {
       // try to move current window to the left-hande-side, due to the offset effect.
       int64_t end = taosTimeAdd(start, pInterval->interval, pInterval->intervalUnit, precision) - 1;
-      ASSERT(end >= t);
-      end = taosTimeAdd(end, -pInterval->sliding, pInterval->slidingUnit, precision);
-      if (end >= t) {
-        start = taosTimeAdd(start, -pInterval->sliding, pInterval->slidingUnit, precision);
+
+      int64_t newEnd = end;
+      while(newEnd >= t) {
+        end = newEnd;
+        newEnd = taosTimeAdd(newEnd, -pInterval->sliding, pInterval->slidingUnit, precision);
       }
+
+      start = taosTimeAdd(end, -pInterval->interval + 1, pInterval->intervalUnit, precision);
     }
   }