Until when you are at work?

[it-is-niaz]

In a workplace, I want to say to my co-workers, who work on different shifts, when they leave work. So, what is the best question?

When do you leave today?
What is your shift today?
Until when you are at work?
Until when you work?

 

[tedmc]

In a workplace, I want to [STRIKE]say to[/STRIKE] ask my co-workers, who work on different shifts, when they leave work. [STRIKE]So,[/STRIKE] What is the best question?

When do you leave today?
What is your shift today?
Until when you are at work?
Until when you work?

Say your co-worker is working the shift from 4.00 pm - 12.00 am.
You: Which shift are you working?
Co-worker: The 4.00 pm shift.

You ask your colleague which shift they are working.

 

[it-is-niaz]

No. I wanted to know when they leave. There are lots of shifts with lots of different times. I just want to ask when they leave as when they get to work I notice that.

 

[Phaedrus]

When do you get off (work) (today)?

 

[Tarheel]

No. I want to know when they leave. There are lots of shifts with lots of different times. I just want to ask when they leave as when they get to work I notice that.

Unfortunately, the third sentence makes no sense.
:-|

 

[Tarheel]

In a workplace, I want to [STRIKE]say to[/STRIKE] ask my co-workers, who work on different shifts, when they leave work. What is the best question?

When do you leave today?
What is your shift today?
Until when you are at work?
Until when you work?

The first two make sense. The third and fourth sentences do not.

 

[tedmc]

What time do you finish work (today)?

 

[emsr2d2]

What time do you finish today?
What time do you get off today?
What time are you on till today?

What time are you escaping this hellhole today? (I'm joking, though you might hear it in places where the people don't generally enjoy being at work.)

 

[it-is-niaz]

Unfortunately, the third sentence makes no sense.
:-|

Sorry. I have rephrased:
I just want to ask when they leave because I notice what time they start working or what time they arrive/get at work.

 

[emsr2d2]

Sorry. I have rephrased:
I just want to ask when they are going to leave because I noticed what time they started working or what time they arrived/got [STRIKE]at[/STRIKE] to work.

You haven't rephrased the third sentence ("Until when you are at work?") at all. Giving us the reason you want to ask them is not the same as rephrasing the question. It was ungrammatical. You could use "Until what time are you at work today?" but it's a little unnatural and sounds old-fashioned/stilted.

Please note my corrections to your post above.

You have been given plenty of good ways to ask your question already. If, for some reason, you need to make it clear that you noticed what time they started work, you could say something like "I noticed you come in at 4. What time are you working till?"