Fix: Scheduled status being sent instantly

[AlyxPractice]

Hello! I encountered an issue while attempting to schedule a status; instead of scheduling, the post was sent instantly. After thoroughly reviewing the API documentation and conducting a debugging session, I've identified the root cause and have proposed a solution in this pull request.

Let me know what you think :)

[mattn]

Thank you

[AlyxPink]

You're welcome @mattn 🙌 Thanks for your work on this library, happy to contribute. I hope you're doing well. Take care ❤️