[TD-5576]<fix>: fix localtime is unsafe in multi threads processing (#7045)

* [TD-5576]<fix>: fix localtime is unsafe in multi threads processing

* remove unecessary debug line

src/plugins/http/src/httpJson.c

@@ -264,8 +264,7 @@ void httpJsonUInt64(JsonBuf* buf, uint64_t num) {
 
 void httpJsonTimestamp(JsonBuf* buf, int64_t t, int32_t timePrecision) {
   char       ts[35] = {0};
-  struct tm* ptm;
-
+  
   int32_t fractionLen;
   char* format = NULL;
   time_t quot = 0;
@@ -301,8 +300,9 @@ void httpJsonTimestamp(JsonBuf* buf, int64_t t, int32_t timePrecision) {
       assert(false);
   }
 
-  ptm = localtime(&quot);
-  int32_t length = (int32_t)strftime(ts, 35, "%Y-%m-%d %H:%M:%S", ptm);
+  struct tm ptm = {0};
+  localtime_r(&quot, &ptm);
+  int32_t length = (int32_t)strftime(ts, 35, "%Y-%m-%d %H:%M:%S", &ptm);
   length += snprintf(ts + length, fractionLen, format, mod);
 
   httpJsonString(buf, ts, length);