How i can say how was your day in Chinese?

There are a few ways to say "How was your day?" in Chinese, depending on the formality and context:

Formal:

* 您今天过得怎么样？ (Nín jīntiān guò de zěnme yàng?) - This is a very polite and respectful way to ask.

* 今天过得如何？ (Jīntiān guò de rúhé?) - This is also a formal way to ask, but slightly less formal than the previous one.

Informal:

* 你今天怎么样？ (Nǐ jīntiān zěnme yàng?) - This is a more casual way to ask, suitable for friends and family.

* 今天过得还好吗？ (Jīntiān guò de hái hǎo ma?) - This is a friendly way to ask, implying that you hope they had a good day.

* 今天怎么样？ (Jīntiān zěnme yàng?) - This is a very informal way to ask, suitable for close friends or family.

You can also use a more specific question, depending on the context:

* 今天工作怎么样？ (Jīntiān gōngzuò zěnme yàng?) - "How was work today?"

* 今天学习怎么样？ (Jīntiān xuéxí zěnme yàng?) - "How was school today?"

* 今天玩得开心吗？ (Jīntiān wán de kāixīn ma?) - "Did you have fun today?"

Remember to adjust the tone and inflection of your voice depending on the context and your relationship with the person you are asking.