Merge pull request #7710 from taosdata/fix/TD-6408

[TD-6408]<fix>: fixed json error when timestamp was before Epoch

src/plugins/http/src/httpJson.c

@@ -272,26 +272,35 @@ void httpJsonTimestamp(JsonBuf* buf, int64_t t, int32_t timePrecision) {
 
   switch (timePrecision) {
     case TSDB_TIME_PRECISION_MILLI: {
+      mod = ((t) % 1000 + 1000) % 1000;
+      if (t < 0 && mod != 0) {
+        t -= 1000;
+      }
       quot = t / 1000;
       fractionLen = 5;
       format = ".%03" PRId64;
-      mod = t % 1000;
       break;
     }
 
     case TSDB_TIME_PRECISION_MICRO: {
+      mod = ((t) % 1000000 + 1000000) % 1000000;
+      if (t < 0 && mod != 0) {
+        t -= 1000000;
+      }
       quot = t / 1000000;
       fractionLen = 8;
       format = ".%06" PRId64;
-      mod = t % 1000000;
       break;
     }
 
     case TSDB_TIME_PRECISION_NANO: {
+      mod = ((t) % 1000000000 + 1000000000) % 1000000000;
+      if (t < 0 && mod != 0) {
+        t -= 1000000000;
+      }
       quot = t / 1000000000;
       fractionLen = 11;
       format = ".%09" PRId64;
-      mod = t % 1000000000;
       break;
     }
 
@@ -319,26 +328,35 @@ void httpJsonUtcTimestamp(JsonBuf* buf, int64_t t, int32_t timePrecision) {
 
   switch (timePrecision) {
     case TSDB_TIME_PRECISION_MILLI: {
+      mod = ((t) % 1000 + 1000) % 1000;
+      if (t < 0 && mod != 0) {
+        t -= 1000;
+      }
       quot = t / 1000;
       fractionLen = 5;
       format = ".%03" PRId64;
-      mod = t % 1000;
       break;
     }
 
     case TSDB_TIME_PRECISION_MICRO: {
+      mod = ((t) % 1000000 + 1000000) % 1000000;
+      if (t < 0 && mod != 0) {
+        t -= 1000000;
+      }
       quot = t / 1000000;
       fractionLen = 8;
       format = ".%06" PRId64;
-      mod = t % 1000000;
       break;
     }
 
     case TSDB_TIME_PRECISION_NANO: {
+      mod = ((t) % 1000000000 + 1000000000) % 1000000000;
+      if (t < 0 && mod != 0) {
+        t -= 1000000000;
+      }
       quot = t / 1000000000;
       fractionLen = 11;
       format = ".%09" PRId64;
-      mod = t % 1000000000;
       break;
     }