refactor:do some internal refactor.

source/common/src/ttime.c

@@ -871,10 +871,10 @@ int64_t taosTimeTruncate(int64_t ts, const SInterval* pInterval) {
     // 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;
 
-    int64_t newEnd = end;
-    while (newEnd >= ts) {
-      end = newEnd;
-      newEnd = taosTimeAdd(newEnd, -pInterval->sliding, pInterval->slidingUnit, precision);
+    int64_t newe = end;
+    while (newe >= ts) {
+      end = newe;
+      newe = taosTimeAdd(newe, -pInterval->sliding, pInterval->slidingUnit, precision);
     }
 
     start = taosTimeAdd(end, -pInterval->interval, pInterval->intervalUnit, precision) + 1;

source/libs/executor/test/timewindowTest.cpp

@@ -151,7 +151,10 @@ TEST(testCase, timewindow_gen) {
   printTimeWindow(&w, precision, k1);
 
   printf("----------------interval_1d_sliding_1d_calendar_offset_1n---------\n");
-  SInterval offset_1n = createInterval(1*86400*1000L, 1*86400*1000L, 1, 'd', 'd', 'n', TSDB_TIME_PRECISION_MILLI);
+  SInterval offset_1n = createInterval(10*86400*1000L, 10*86400*1000L, 1, 'd', 'd', 'n', TSDB_TIME_PRECISION_MILLI);
+    getInitialStartTimeWindow(&offset_1n, k1, &w, true);
+    printTimeWindow(&w, precision, k1);
+
 
 }