How do you write have a good day in Chinese?

There are a few ways to say "have a good day" in Chinese, depending on the context and the level of formality. Here are some options:

Formal:

* 祝您今天愉快 (zhù nín jīntiān yúkuài): This is the most formal way to say "have a good day." It literally means "Wish you a happy day."

* 祝您一天順利 (zhù nín yītiān shùnlì): This means "Wish you a smooth day." It implies that you wish the person to have a day free from problems.

Informal:

* 今天過得開心 (jīntiān guò de kāixīn): This means "Have a happy day." It's a more casual and friendly way to say "have a good day."

* 祝你今天順心 (zhù nǐ jīntiān shùnxīn): This means "Wish you a pleasant day." It's a little less formal than "祝您一天順利."

Even more casual:

* 你今天要開心哦 (nǐ jīntiān yào kāixīn ó): This means "Have a happy day!" It's a very casual and friendly way to say "have a good day."

The best way to choose the right phrase is to consider your relationship with the person you're talking to and the context of the conversation. For example, you would use "祝您今天愉快" when speaking to a stranger or someone in a position of authority, while you would use "今天過得開心" or "祝你今天順心" when talking to a friend or family member.