How do you say how is your day going in Mandarin?

There are a few ways to say "How is your day going?" 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 formal way to ask, suitable for elders or people in positions of authority.

* 您今天还好吗？ (Nín jīntiān hái hǎo ma?) - This is slightly less formal than the first option, but still polite.

Informal:

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

* 你今天过得还好吗？ (Nǐ jīntiān guò de hái hǎo ma?) - This is a slightly more polite version of the informal phrase.

* 你今天怎么样？ (Nǐ jīntiān zěnmeyang?) - This is the most informal version, suitable for close friends.

Other options:

* 你今天过得开心吗？ (Nǐ jīntiān guò de kāixīn ma?) - This means "Are you having a good day?"

* 你今天有什么事吗？ (Nǐ jīntiān yǒu shénme shì ma?) - This means "What are you doing today?"

The best way to choose the right phrase depends on your relationship with the person you are talking to.