[TD-13970]<feature>: timestamp format shortcut

src/os/src/detail/osTime.c

@@ -336,8 +336,11 @@ int32_t parseLocaltime(char* timestr, int64_t* time, int32_t timePrec, char deli
   }
 
   if (str == NULL) {
+    //if parse failed, try "%Y-%m-%d" format
+    if (!strptime(timestr, "%Y-%m-%d", &tm)) {
       return -1;
     }
+  }
 
 #ifdef _MSC_VER
 #if _MSC_VER >= 1900
@@ -378,8 +381,11 @@ int32_t parseLocaltimeWithDst(char* timestr, int64_t* time, int32_t timePrec, ch
   }
 
   if (str == NULL) {
+    //if parse failed, try "%Y-%m-%d" format
+    if (!strptime(timestr, "%Y-%m-%d", &tm)) {
       return -1;
     }
+  }
 
   /* mktime will be affected by TZ, set by using taos_options */
   int64_t seconds = mktime(&tm);