fix sign

Author: Robert Schmidtke

pandas/_libs/src/vendored/numpy/datetime/np_datetime.c

@@ -349,7 +349,7 @@ static int scaleAndOffset(int64_t timestamp, int64_t scale, int64_t offset,
     // if the requested timestamp is just below that, doing the calculation
     // in reverse from the absolute minimum timestamp could work
     if (timestamp == min_scalable_timestamp - 1) {
-      const int64_t min_offset = (NPY_MIN_INT64 + 1) % scale;
+      const int64_t min_offset = scale + (NPY_MIN_INT64 + 1) % scale;
       if (checked_int64_sub(offset, min_offset, result) != 0) {
         return 1;
       }