Passed my manual test, output nothing different.
Excuse me, I forgot change output in #2186
* Update fixed error code from merged commit According to [this](https://github.com/gin-gonic/examples/commit/874dcfa6c457aa23996d67fa595a2acb8ea1f44b) merged commit. * Fixed incorrect testing date. Original testing date incompatible demo require, can't get expect result. check_in date need NOT AFTER check_out date.