How do yo say how was your day in mandarin?

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

Formal:

* 您今天过得怎么样？ (Nín jīntiān guò de zěnmeyàng?) - This is the most polite and formal way to ask.

* 您今天过得如何？ (Nín jīntiān guò de rúhé?) - This is similar to the first option but slightly less formal.

Informal:

* 你今天过得怎么样？ (Nǐ jīntiān guò de zěnmeyàng?) - This is the most common way to ask a friend or someone you know well.

* 你今天怎么样？ (Nǐ jīntiān zěnmeyàng?) - This is a more casual way to ask.

* 今天怎么样？ (Jīntiān zěnmeyàng?) - This is the most informal way to ask, and is typically used with close friends or family.

You can also use the following phrases, which are more literal translations of "how was your day":

* 你今天过得如何？ (Nǐ jīntiān guò de rúhé?) - This translates to "How did you spend your day?"

* 你今天怎么样？ (Nǐ jīntiān zěnmeyàng?) - This translates to "How are you today?"

The best way to choose which phrase to use depends on your relationship with the person you are speaking to and the situation.